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Originally Posted by Badbob
The specification given in the GZ250 owners manual is for an automotive oil.
I only run synthetics. I have almost 16000 miles on my GZ with over 10,000 of it with synthetic oil. Your problem is buying automotive oils that that in recently they have changed the specs on the oil to one that requires friction modifiers. (SF I think it is) In any case you will have a difficult time finding automotive oil that doesn't have these in them.
Currently the only automotive oil available in my local area that works is Rotella. I am currently using Rotella Synthetic T 5W-40.
Its seems kind of odd to me that I now have oil that is to slippery.
Motorcycle oil has been for a long time the same stuff different bottle with a higher price tag. In some cases not even as good as the automotive oil. With the new SF spec we will have to pay extra to get oil that isn't to slippery (Old technology).
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I use Rotella Synthetic also in the GZ250 and our 2 C50s. Works great and is reasonably priced and easy to find. Their regular dino is good too. This is what a large number of C50 riders use too at the Volusiariders.com forum (quite a large group of knowledgable folks).
Cheers!