^1 as I have done the same for over 30 years. No ethonal, TCW-III certified oil, stabil when it sets and run motor dry of fuel before storage. Check puregas.org online for stright gas, no ethanol, near you.79 1/2 115hp inline 6, merc classic 50, yamaha pro-50, Fastwin 18hp, scott attwater 7.5, from 16:1 to 50:1 I have used tcw-iii generic from local farm store for many years, since it came out, never any problems. If the oil certified to TCW-III, I don't care who makes it.
edit: I can still buy fuel with NO alcohol. I get whatever I can in octane that has NO alcohol. I use marine stabil because I like their TV adds.
Ronnie, Normally Amsoil is not TCW-III certified. I would not recommend it for that reason.
Do I hear an oil thread?