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I have a '98 with 127k miles on it. It is running realy well. I have some questions for the forum.
I use M-1 10-30. My son is telling me to use 10-40.
Does 10-30 / 10-40 realy matter ? Which is best ? Is there something better ?
I've noticed many manufacutures going away from M-1 and now endorcing Castrol.
Why ?
Since it is a '98, I have considered using my motocycle oil since that has older style ratings.
Any thoughts ?
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