Brian Posted March 28, 2008 Share Posted March 28, 2008 hehe i can answer this one When i had my little 50HP two stroke outboard, i thought i would buy the best synthetic motor bike 2 stroke oil on the market. It had a holding tank on the otboard, so there was no pre mixing. It used to get through loads of oil. When i had it serviced, the service guy said that you must use Marine grade 2 stroke oil as its thicker than the synthetic motor bike oil. THis was why i was getting through loads of oil. So if your outboard mixes it automaticly, then use the marine outbaord oil ( i found it cheaper than motorbike oil ) If you pre mix it in the petrol tank then any 2 stroke oil will be fine. Quote Link to comment Share on other sites More sharing options...
Antares_9 Posted March 28, 2008 Share Posted March 28, 2008 Yes, it is designed not to "whisker" the plug(s) at the lower temperatures that O/Bs run at, has better anti corrosion properties and will not seperate as readily over time and produces less carbon build up. May I suggest you buy one from a recognised brand that conforms to TWCIII if not buying the one marketed by your O/B manufacturer. :-D Quote Link to comment Share on other sites More sharing options...
Antares_9 Posted March 28, 2008 Share Posted March 28, 2008 It’s not really that they are water cooled per se Pete, more that they are raw water cooled, the same goes for inboard engines unless they are via a heat exchanger then they run at the same temperature as a “normal†land based unit. This really shows it’s self when you connect either a calorifier or a heater matrix to a raw water cooled motor, the difference in efficiency is remarkable, I even went to the extent of fitting a fresh water cooling kit to our last Mercruiser for just that reason. Quote Link to comment Share on other sites More sharing options...
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