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Ā· Over Hill Sailing Club
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I would definitely stay with the viscosity recommendations in the manual. 5w- might be too thin. Oil types have changed, so you probably won't find the letter designations like CD, etc. I have used Rotella 10w- or 15w- for a few years now with no problems. I would stay completely away from synthetics in an old engine. They tend to get past old gaskets and seals. If you search the archives, we have discussed this before and I think I posted a link to a website with the equivalent letter designations-old to new.
 
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