I have been using TCP for quite a while in my 1946 C-85 equipped Ercoupe running both 100LL and Mogas. I ran out of TCP and on the advice of several folks started using MMO in my fuel (Mogas only) instead of TCP. After 50 hours on my new plugs I pulled them to clean and rotate them. I was shocked at the amount of gunk on the plugs. I never had oily buildup using TCP. I’ve switched back to using only TCP in my fuel. Next 50 hour check will tell the story although I probably already know the results given I had only used TCP previously. I don’t know what my valves look like, but when we did a top overhaul about 100 hours ago after using TCP the valves were clean.
Randy B
Verified Purchase
Alcor TCP Fuel Additive Quart
October 22, 2024
Perfect
Saubion
Verified Purchase
Alcor TCP Fuel Additive Quart
October 10, 2024
Keeps the plugs clean when running leaded fuel.
Jeff W
Verified Purchase
Alcor TCP Fuel Additive Quart
October 5, 2024
Works great in my Continental O-470 engine originally designed to run on 80 octane fuel. No lead fouling. Plugs always look good when checked. No deposits. Highly recommend for 80 octane engines.
James W
Verified Purchase
Alcor TCP Fuel Additive Quart
September 24, 2024
Michael T
Verified Purchase
Alcor TCP Fuel Additive Quart
August 28, 2024
Haven’t ran long enough yet
Clay C
Verified Purchase
Alcor TCP Fuel Additive Quart
July 31, 2024
Absolute necessity in my Lycoming O-235-C1
Paul B
Verified Purchase
Alcor TCP Fuel Additive Quart
July 30, 2024
Easy to use with the dispenser. Put it in the fuel a week ago.
Joseph S
Verified Purchase
Alcor TCP Fuel Additive Quart
July 24, 2024
A very effective lead scavenger and especially useful in selected Lyco engine configurations. Combined with proper leaning, TCP has essentially eliminated plug contamination!
J. P
Verified Purchase
Alcor TCP Fuel Additive Quart
June 29, 2024
Randy B
Verified Purchase
Alcor TCP Fuel Additive Quart
May 3, 2024
I have been using Alcor TCP for several years and have found it to be effective in preventing lead deposits on my spark plugs and valves.
Richard S
Verified Purchase
Alcor TCP Fuel Additive Quart
April 24, 2024
Hoping it works and keeps the engine running for many hours to come
Paul R
Verified Purchase
Alcor TCP Fuel Additive Quart
March 18, 2024
Seems to keep the engine healthy
Paul R
Verified Purchase
Alcor TCP Fuel Additive Quart
February 17, 2024
I have been using this product for quite a while and have found it to preform as it advertises. No lead build up at all. My engine loves it..
Perry S
Verified Purchase
Alcor TCP Fuel Additive Quart
January 2, 2024
Most of it leaked out in the package
Ben H
Verified Purchase
Alcor TCP Fuel Additive Quart
January 2, 2024
Excellent product. My old TCM engine would not run very well for long without it!
Dan B
Verified Purchase
Alcor TCP Fuel Additive Quart
December 19, 2023
Richard M
Verified Purchase
Alcor TCP Fuel Additive Quart
December 5, 2023
Just started using so have not noticed any difference but a friend who uses regularly and recommended swears by it.
Jay S
Verified Purchase
Alcor TCP Fuel Additive Quart
October 10, 2023
Gary H
Verified Purchase
Alcor TCP Fuel Additive Quart
October 10, 2023
Have used TCP since the end of 80 octane avgas availability, with good results.
William R
Verified Purchase
Alcor TCP Fuel Additive Quart
October 5, 2023
White B
Verified Purchase
Alcor TCP Fuel Additive Quart
October 3, 2023
All the experts say it can’t hurt to use TCP so hopefully it’s keeping our engine happy!
Paul R
Verified Purchase
Alcor TCP Fuel Additive Quart
September 27, 2023
our mechanic says spark plugs are free of lead deposits at every annual since we started using tcp several years ago.we have not had any leaking exhaust valves since using it,we had several problems prior.
Larry S
Verified Purchase
Alcor TCP Fuel Additive Quart
September 8, 2023
White B
Verified Purchase
Alcor TCP Fuel Additive Quart
August 31, 2023
‘necessary when running “low lead” gasoline in a low compression aircraft engine. Continental A75. Don’t leave the ground without it.
Dave Y
Verified Purchase
Alcor TCP Fuel Additive Quart
August 20, 2023
Works very well on all of my aircraft
Andrew B
Verified Purchase
Alcor TCP Fuel Additive Quart
July 5, 2023
alcor works just great in my Jabiru 3300. Been using it for eight years and every year at annunal the plugs are always clean.
Bob O
Verified Purchase
Alcor TCP Fuel Additive Quart
June 14, 2023
John B
Verified Purchase
Alcor TCP Fuel Additive Quart
May 16, 2023
Randy R
Verified Purchase
Alcor TCP Fuel Additive Quart
November 23, 2022
Great product, but would definitely like to see a better method for dispensing. The plastic syringe is junk!
Paul R
Verified Purchase
Alcor TCP Fuel Additive Quart
October 16, 2022
Flight F
Verified Purchase
Alcor TCP Fuel Additive Quart
September 23, 2022
John F
Verified Purchase
Alcor TCP Fuel Additive Quart
September 20, 2022
Works well.
Glenn M
Verified Purchase
Alcor TCP Fuel Additive Quart
August 31, 2022
No problem
Karl S
Verified Purchase
Alcor TCP Fuel Additive Quart
August 29, 2022
Herb L
Verified Purchase
Alcor TCP Fuel Additive Quart
July 16, 2022
J. P
Verified Purchase
Alcor TCP Fuel Additive Quart
July 15, 2022
O-320 has no sparkplug fouling issues when this product is used. Plugs stay clean.
Rick D
Verified Purchase
Alcor TCP Fuel Additive Quart
June 28, 2022
I use it for my C90 engine to lubricate the engine.
Ismael B
Verified Purchase
Alcor TCP Fuel Additive Quart
June 4, 2022
Great Product
Steve W
Verified Purchase
Alcor TCP Fuel Additive Quart
May 13, 2022
White B
Verified Purchase
Alcor TCP Fuel Additive Quart
February 10, 2022
This will help keep your engine from leading up using 100LL. However, this is a hazardous material, and Ive been told a carcinogen, so use carefully.
D. R
Verified Purchase
Alcor TCP Fuel Additive Quart
February 4, 2022
Gary S
Verified Purchase
Alcor TCP Fuel Additive Quart
December 29, 2021
Have used Alcor TCP faithfully for over 15 yrs in my Grumman Tiger’s Lyc 0-360. With fairly aggressive leaning on the ground and just ROP in the air, my plugs have never shown any notable lead build-up at annual. Not so prior to TCP. Great product in easy to use containers with calibrated syringe.
J. P
Verified Purchase
Alcor TCP Fuel Additive Quart
December 24, 2021
The best thing for my engine
Chris R
Verified Purchase
Alcor TCP Fuel Additive Quart
November 26, 2021
Rich G
Verified Purchase
Alcor TCP Fuel Additive Quart
November 25, 2021
A must have with Chevy engines. Doesnt hurt the older Continentals either
Belted A
Verified Purchase
Alcor TCP Fuel Additive Quart
November 23, 2021
A must for my 2 stroke engine running 100LL
Good stuff.
Jim D
Verified Purchase
Alcor TCP Fuel Additive Quart
November 2, 2021
so far so good. Havent noticed any fouling in 3 fill ups
Jay O
Verified Purchase
Alcor TCP Fuel Additive Quart
October 31, 2021
No problem with Alcor, it is highly recommended for low compression engines to keep the led in 100ll suspended (less plug fouling)
Karl S
Verified Purchase
Alcor TCP Fuel Additive Quart
September 16, 2021
I put this in a Stearman and have not had plugs foul out, yet.
Richard T
Verified Purchase
Alcor TCP Fuel Additive Quart
September 16, 2021
My aircraft has a Continental O-470S1B engine which was certified as an 80 octane engine. I have been using TCP in my engine for 27 years since 80 octane fuel has not been available for several decades. My engine runs very smoothly and I havent had a problem with lead fouling while using TCP. Every time my plugs are pulled, they are very clean with minimal deposits. I am convinced that the smooth operation and longevity of my 80 octane engine is due to my use of TCP fuel additive.
James W
Verified Purchase
Alcor TCP Fuel Additive Quart
August 23, 2021
Expensive, but does help keep the plugs (massive electrode) from fouling and easy to clean.
Joseph C
Verified Purchase
Alcor TCP Fuel Additive Quart
August 18, 2021
This product reduces chance of lead fouling and heat stress on cylinders due to lean burn setting on mixture control.
C-air
Verified Purchase
Alcor TCP Fuel Additive Quart
August 13, 2021
Good stuff. Happy it got delivered!!
Simon F
Verified Purchase
Alcor TCP Fuel Additive Quart
August 12, 2021
Great product, lousy packaging. They always leak. Last shipment was empty and had to be re-ordered. They really need to change the container
Goodfriend A
Verified Purchase
Alcor TCP Fuel Additive Quart
August 12, 2021
spark plugs are staying very clean
Rich B
October 21, 2020
I was skeptical when I bought a Stinson with a Franklin engine and was introduced to Alcor/TCP. One look at the plugs at annual and we started using it in a Cessna 150 with an O-200. You simply cant believe how clean your plugs are after 50 hours of burning 100LL.
Richard M
September 30, 2020
I have used this product for over 30 years. Keeps the plugs clean in my O300D. I did like the gallon size better.
John E
September 8, 2020
I was having detonation issues (up to 3 times) after pulling the mixture out when cutting the engine in my Continental E225-8, almost embarrassing. My mechanic asked me to start using this product and upon the next flight, then engine did not have the pre-ignition / detonation occurrence 3 times. I use the 30 ml to 10 gallons and have used about 3 times thus far and it seems to be working as I barely get any spit or sputter after pulling the mixture. As current, I will keep using this product and currently I definitely recommend as it seems to be helping quite a bit and I do not see any negative to engine temps, exhaust gas temps. Very pleased so far. 9/1/2020
Justin S
September 1, 2020
Cant fly my Stinson with a 165hp. Franklin without it.
Tom J
July 27, 2020
Spark plugs stay clean, no more lead balls
Rich B
July 16, 2020
Im convinced this stuff works. Dramatic reduction in lead oxide on the spark plugs at annual time.
Roger F
May 29, 2020
I use this product religiously. So far, so good.
Jim E
May 16, 2020
Been using for years great product
Bill A
April 19, 2020
works well on my old planes
Jerry M
April 13, 2020
TCP has been very effective in reducing spark plug leading between annuals on my Continental 0-200 engine.
The price is higher than I remember paying in the past. I hope you can negotiate lower prices in the future.
Michael M
March 29, 2020
I use religiously in my Beech Musketeer & Cherokee 6. Highly recommended to reduce spark plug fouling...
Chip M
January 12, 2020
Have been using Alcor TCP for 20 years. Keeps the plugs in my Grumman Tiger whistle clean and free of lead deposits. esp with aggressive leaning as recommended during ground ops. A necessity for some carburated engine configurations.
Jpl
January 6, 2020
TCP is exactly what it is advertised as. :) The only problem is that many times the lids are not tight and it leaks in the shipping.
Louise W
December 27, 2019
The Lycoming O235 in my C152 is very prone to spark plug fouling from the lead in 100LL. TCP fuel treatment has completely eliminated that problem. The engine runs better too. My A&P notices the difference during my annual inspection.
Richard S
December 11, 2019
Using this product makes Spark plug fouling and sticking valves a thing of the past !!! And....Spruce sells it at an unbeatable price. (I saw this product sell for 74$ )
Raymond R
November 21, 2019
I don’t usually bother to “rate” products but as an A&PIA and pilot/CFI that’s been a professional in the aviation community for a bit over 50 years I have had numerous small Continental owners limp in with sticking valves as a result of TEL (tetraethylead) fouling. TCP is the one, faa “approved” solution. It will NOT remove existing deposits and it’s a bit pricy but it DOES prevent the problem. Without is all A, and C series and particularly C-145/O300 will lead foul on 100 L L. Even a mix of autogas and 100 eventually end with sticking valves (and plugs).
Terk W
October 18, 2019
Good stuff.
Never a problem with fouled plugs on my O-320!
Shawn
July 29, 2019
My Cherokee 180 was having issues with fouling and valve deposits. After using TCP in two successive tanks my O-360 is running perfectly smooth and plugs are clean with no lead deposits. I now use TCP in every or every other tank fill up.
Jason
July 16, 2019
My engine seems to have better power and starts up first blade spin since Ive been treating the fuel.
although i run fine wire plugs i get 0 lead fouling now very happy.
Doug S
April 21, 2019
Definitely makes a difference in the performance of my 64 C150D.
Philip W
December 6, 2018
a fair price and quick delivery
John T
October 11, 2018
A Top Shelf product and highly recommend.
Chip
October 6, 2018
I have been using TCP for a couple of years now in my C-182 (bladder tanks) and have found it to be very effective in reducing lead fouling on the plugs and lead deposits in general.
The stuff needs to be handled carefully. (Package says not to get it on your paint.) Hauling it around and injecting it at every fill is inconvenient. I bought a sealed plastic container to keep it in ($10 from Amazon search on: LOCK & LOCK Airtight Square Tall Food Storage Container 135.25-oz / 16.91-cup) and that gives me peace of mind when Im carrying it in the baggage area (which is all the time).
Sure, I wish it was cheaper... but I think the advantages outweigh the cost or I wouldnt keep buying it. I found the shipping charges to be reasonable. I usually get at least 2 cans per order.
Steve
September 28, 2018
Very effective in my 165 Franklin
John
July 21, 2018
I have been using this product in two RV-12 aircraft with the Rotax 912 for the past three years. In comparison to Dekalin it keeps the oil and the spark plugs cleaner and removes the lead better. Great product!
David M
February 12, 2018
Started using TCP in my Stearman W670 Continental at 100 hours SOH Valves and plugs are clean the fine wire plugs can be cleaned with a small blast of air from the portable compressor. No more fouling ever.
Bob
September 15, 2017
Started using this after I replaced all 4 cylinders on my Continental O-200. After 1 year and 100 hours, plugs were the cleanest plugs I had ever seen in an aircraft engine and the compressions were all 80/80! Highly recommend this product!!
Jason
May 10, 2017
The product makes a world of difference in my Lycoming IO-540 as far as lead fouled plugs goes. It simply is no longer an issue. Bit of a hassle injecting it with each fuel fill, but worth the effort and cost to me. Have used it for several years now.
Don
April 24, 2017
My Carbon Cub would get black/grey lead film on the shocks/landing gear just aft of the exhaust that was really hard to get off. As soon as I started using TCP, the pesky film all but stopped. Also just scoped all cylinders, and did not find any lead deposits on exhaust valves or Pistons at 200 hrs.
Steven
May 22, 2016
From day one new, had a terrible time with the Lycoming IO-540 in my Commander 114B lead fouling plugs when ground running @ 1200 RPM, even with the fuel leaned. Sitting long in line for take-off or IFR clearance would almost guarantee a bad mag check. Not good, especially at a large and busy airport. Went to fine wire plugs which helped a lot. But for a 100% cure, have used TCP for the last several years. Wouldnt fly without it. Wish they would go back to gallon containers though. Was cheaper than 4 individual quarts.
Don
February 12, 2016
This product is awsome, used as directed it will absolutely prevent lead fouling no fouling means no plug cleaning pays for itself.
Bill
April 6, 2015
During a tail wheel endorsement training I noted the Cub owner, A&E, w/IA, & CFI refueled with this (Alcor's TCP Fuel Additive). He explained the benefits, and success.
When I finished the restorization of my J3, with A75-8 I started using it. I have been using it now for the last 500 hours, in 7 years. At annual, my IA says keep using it. Compressions, and exhaust valves are great.
It hurts me to hear stories from pilots of stuck exhaust valves in the small engines.
Rollie L
February 5, 2014
Heard about TCP from a Cub driver, hoping it will make plug fouling a thing of the past. So far it has been easy to use, the syringe fitting in the can works very well... :)
Donn C
Verified Purchase
Alcor TCP Fuel Additive Quart
October 29, 2024
Great product to cut down on fouled spark plugs & valves. Just wish the provided a better syringe dispenser. I’ll give 5 stars when they do.
Paul R
Verified Purchase
Alcor TCP Fuel Additive Quart
October 1, 2022
It works
Paul B
Verified Purchase
Alcor TCP Fuel Additive Quart
May 17, 2022
Works great, shipping is terrible though.. played down in box bolth times... shipped twice still dont have a full bottle
Frank M
July 21, 2020
Dont know why you shipped from Georgia to Oregon.
No leaks, no dents: OK.
J J
August 5, 2019
Seems to reduce the lead on the plugs by half, which I think is great. Been using and will continue using.
Chris
June 25, 2018
Great Product! Ridiculous charge for shipping!
D. M
October 21, 2017
The can had leaked. And I had a real problem getting the top off. I was getting 1 out of 4 tries. I tried another three times with same results. 1 out of 4. I called Alcor and explained the leak and top problem. The guy said it was probably a bad top. He would have another Alcor employee call me. Nothing. Alcor customer support is nonexistent.
Ed S
Verified Purchase
Alcor TCP Fuel Additive Quart
April 24, 2024
Need to find different product. Cap is impossible to open, yet leaks. Continuing problem
Herb L
Verified Purchase
Alcor TCP Fuel Additive Quart
June 28, 2023
Seems to help keep the spark plugs clean. The dispenser is not easy to use. Over priced. Lid on can does not seal well. Two cans leaked when shipped.
Frank S
January 1, 2023
I’ve been using TCP Religiously for two years on my C-85. I’m doing a top overhaul now and the tops of my pistons and the interior of my cylinders and valves were heavily carbon deposited. So, I’m not sure TCP has helped or not. I will continue using it since I have two cans and then look closely at the plugs to see what they reveal. If clean, I’ll give another review.
Randy B
Verified Purchase
Alcor TCP Fuel Additive Quart
August 31, 2022
Can leaked, everything was wet. Top was taped but still leaked.
Doug M
Verified Purchase
Alcor TCP Fuel Additive Quart
November 17, 2021
Once again the can leaks in the shipping process. Not the first time. Needs a different type top
Jon C
Verified Purchase
Alcor TCP Fuel Additive Quart
August 18, 2021
Haven’t used the product yet because of the container top it comes with! If a syringe is required to use this product, then include it with the product when you ship it!
For the cost of the product, it should certainly be included if it is needed for use. Was no mention of a syringe needed when I ordered from aircraft spruce.
Would think there would be a better way to dispense product from the container. Or just have a normal top so product could be dumped into a measuring cup of some sort.
Scott S
September 27, 2019
The shipment arrived poorly packed and some of the packaging was damp because at least one of the containers spilled during shipment. My pilot said the shipment was ok to accept.
Lance B
July 29, 2019
My engine would run beautiful on no lead auto gas, CA screw ups messed that up with the 10% alcohol. No clean auto gas to be found in CA !! Now I have to add TCP to the 100LL and still had 2 Exhaust valves mess up, excess lead, within 1 1/2 years. Replace with overhauled $600 cylinders. My hourly rate is skyrocketing, blaming it on the Sacramento Gang. Just venting do not know what would happen without TCP
Karl
March 23, 2017
Great stuff, but buy in person shipped UT spills everywhere
Frank J
Verified Purchase
Alcor TCP Fuel Additive Quart
May 17, 2022
Product is great, but bottle leaked during shipping. almost 1/4 of its contents. Cap was loose.
Pete R
September 29, 2020