Steps wrote: The line of thought with 2S outboards is a use lower octane fuel so it burns across combustion chamber slower burning more of the oil mixed in the fuel. Actually higher the octane (with correct cylinder pressure not compression ratio) the slower the burn hence the more advance needed..(exception being LPG /cng fuels).with 2S oil that is compensated for in the spark advance giving the required longer burn for the oil Our 91 meets the USA outboard requirements , thu manual do say dont use fuels with add methanol I dont like cheaper oils they don’t burn as well causing the motor to smoke more. Been there done that.. just need to run a cheap and note the carbon build up around the prop hub.. then a manufactures brand and talk to service shop mechanic number engine failures due to cheaper low quailty oils with ut the required expensive additives. Covering in many old posts. I buy my evinrude oil by the 20L drum An exhaust leak won’t mean more oil in the drum when you run the engine. think thru what I know , how things are built in there , thats pretty much the conclusion I came to.. but have never been full sure of it.. |
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