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I have several bikes and a 98 Izusu Trooper and want to standardize my oil so I just stock 1 brand/weight..

I was thinking Castrol 15W50 semi-synthetic.

Any thoughts, advise or recommendations?

Will mixing different weight semi synthetica cause problems?? e.g 10w40 with 15w50 same brand.

Re: Best Brand &Weight: Semi-synthetic oil for

I think 10w40 is not typically thought of as the best weight oil for a Duc, I am not sure why you would want to mix weights?

There are some very knowledgeable oil people here on the list.
Considering the desmo valve drive train, I think a good high shear fully synthetic 15w50 is a good bet, from which there are many to chose from.
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