Posts: 938
Location: NeverNever Lake | Mobil 1 synthetic is the only oil I use and I use it in every motor I own.
My 9.9 only holds a little over a quart and I change it way ahead of time. And yes, I use the 90wt lube in the lower unit too. I have heard it might not be a good idea to use in lower unit, only time will tell.
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