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There's a school of thought that allows as how the old Triumph twins were best served with a straight 50 weight. Apparently heat shear on the oil is an issue with the older twins.

I wonder if anyone makes a synthetic straight weight 50W?


Let me throw out a bomb while I'm here - while I will agree that synthetic oil is a good thing, no one has ever proven in independent, non-manufacturer sponsored comparative testing, that synthetic can or will extend engine life.

If anyone has such proof, please bring it forth. I've been looking for 29 years, and still can't find any proof.

postscript - I have no interest in hearing what any oil maker has to say in this regard. They obviously are going to blow their own horns.



Some interesting points but I'd stay away from the 50W for sure. Most wear occurs at start-up. Single weight 50 is just to thick and doesn't have good flow at start-up. Much better off with a multi weight for our bikes. I don't think heat shear is an issue. Our bikes have oil coolers and large heat sinks to stay cool. The synthetic oils have a much wider operating temperture range.

Live Free or Die Velvet