Sticking valves needs additives like Marvel Mystery Oil / TCP. Until the 100LL goes away everyone needs to be vigilant and do whatever we can to prevent excessive leading problems.
Quote from: Klaus on July 29, 2010, 08:16:12 AM Sticking valves needs additives like Marvel Mystery Oil / TCP. Until the 100LL goes away everyone needs to be vigilant and do whatever we can to prevent excessive leading problems.From the MSDS MMO is ~75% naphthenic hydrocarbons, ~25% mineral spirits (Stoddard solvent, i.e., paint thinner), with a splash of wintergreen scent.My take on the ingredients is that the naphthenic hydrocarbons are a thickener like paraffin, the paint thinner cuts the thickener for pouring. The wintergreen is simply a pleasant scent. If put into engine oil the mineral spirits evaporate when the engine warms leaving behind the thickener. Seems innocuous, though pointless. It might be interesting for someone to put a measured amount of MMO in a container and let it sit for a few weeks then compare the volume and consistency with the original.If put into the fuel tank both the paint thinner and the thickener are burned in the cylinder. This seems innocuous and pointless as well. Our engines are designed to burn some oil so a bit of thickener is unlikely to hurt anything. The thing I worry about is the effect of the thickener on the carburetor. I know pilots have been putting MMO in their gas for decades, but I'd never put it in my gas.
Where does one get TCP in the Seattle area?