2daMax
Active Member
I was a fan of TCW3 once until I saw the effects of carbon deposits on the intake valve (increasing). I like that this Outboard oil gives a slight boost in power and smoothen the engine and believed that it will clean up carbon deposits in the cylinders and rings. It maybe true that it does, but I noticed that the deposits were increased at the intake valves, which is outside of the combustion chamber.TCW-3 dosed at 1oz per 5 gallons of gas has very similar effects to Marvel's Mystery Oil.
I have used TCW-3 in regular gas engines (including my S-10) for years and it really does help keep the valves and piston tops clean, lubricated and rust free. Marvel's Mystery Oil (MMO for short) is good stuff too and has been proven for years. MMO is more expensive than TCW-3 because it is dosed at 2oz per 5 gallons of gas.
Prior to using TCW3, I had used Gummout Fuel System cleaner. I use a scope to view the intake valves after the treatment which was almost perfectly clean except for a few small spots. Then I add in TCW3, 5 quarts to a Gallon dilution, rode a full tank of fuel, and inspected the intake valves again. Carbon deposits has significantly increased. Could not believe it and bitter pill to swallow as I had bought a gallon of this stuff.
Now I will use Fuel System cleaner once every 5k km to clean out the intake valves.