just another thought,when i would test 2cycle/4cycle engines for compression loss,or a bad valve i would do what is called a wet and dry compression test.when you add oil to the compression chamber and don't have a bad burnt or bent valve,the compression always rises?so i would say adding more oil content would raise compression but not to a point to where it would actually matter much,fluids can be compressed such as air,but liquids they are such a minute amount that it would be dangerous to add fluid directly to a compressing piston in excess.i have replaced too many bent piston rods/blown pistons and engine blocks/valves and cylinder heads due to detonation from liquids getting on top of the piston.the oil in either ABC or ringed engines is what aids in compression and reduces friction along with the nitro/methanol.run one of these engines without any oil and see how good they run and how long they last.