Definitely fill the motor with 50/50 mixture of 20w-50 and 75w-140 gear oil. Super thick stuff, won't seep past rings or out of seals. This isn't in your owners manual because it is a conspiracy by the EPA and auto companies to sell more engines.
P.S. a good used M20 longblock is like $250 in most places. I picked one up for $100 once. Just put a new damn motor in the poor car.
P.S. a good used M20 longblock is like $250 in most places. I picked one up for $100 once. Just put a new damn motor in the poor car.
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