Quote:
Originally Posted by tubman
Hmm. Interesting to hear this. Back in my snowmobiling days, it was a definite no-no. Nobody ever gave a good reason, though.
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One requirement for an oil to meet a standard (such as SJ, etc.) is that it has to be compatible with all other oils meeting that same standard.
There were a lot of myths and misunderstandings floating around in the early days of synthetic oil. Much like with the zinc "issue" today.