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Terry, NJ · 05-15-2018, 07:33 AM

I use the 15/40 sold at TSC as most other Mod. A owners. 20/50 is airplane oil. For use with air-cooled engines with large clearances. My feelings are that you don't need it. The STP is, in addition to being a low friction additive, it clings. I'm told you cannot totally remove it with a solvent. It is useful in engines that may not be run for a while. It Helps prevent moisture rusting on the internal parts such as the cam and cylinder walls. I use a little MMO in the gas (not the oil) to help lubricate the valves.
Terry

05-15-2018, 07:33 AM	#10
Terry, NJ Senior Member Join Date: May 2010 Location: Bucks Co, Pa Posts: 3,740	Re: Another question about oil viscosity I use the 15/40 sold at TSC as most other Mod. A owners. 20/50 is airplane oil. For use with air-cooled engines with large clearances. My feelings are that you don't need it. The STP is, in addition to being a low friction additive, it clings. I'm told you cannot totally remove it with a solvent. It is useful in engines that may not be run for a while. It Helps prevent moisture rusting on the internal parts such as the cam and cylinder walls. I use a little MMO in the gas (not the oil) to help lubricate the valves. Terry