Re: Need Spark Plug Info For Sears 7 HorsePower
Outboard oil (TC-W3) doesn't work well in a high temperature, air cooled engine. It's ment for water cooled engines. If the engine is still running strong I doubt you've harmed it at all. Some TC-W3 oils actually work as air-cooled two stroke oils as well.<br /><br />TC oil is just the designation for two stroke (cycle) oil. The stuff you get at the hardware store or gas station for chainsaws, weedwackers, snow mobiles, or other air cooled 2-stroke engines. It survives the high temperatures but in a water cooled outboard it'll cause deposits and problems over time.<br /><br />Wrong spark plug will certainly cause that kind of problem. I don't think the outboard oil would cause anything like that. Just wear out the engine a little faster. A fuel restriction or weak fuel pump would be my next guess.