Quote:
Originally Posted by Sdgg91
Howdy,
What is the recommended motor oil to use on a 964 that has been bored to 3.8L?
I recently purchased and want to change the oil for obvious reasons but am unsure what is the best to run in here. Car is mostly canyon carver and street.
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There several good oils, but the spec remains the same as for stock
for temps above 30F
10w-40, 15w-50, 15w-40 or 5w-40 syn : 5w-40 Shell TMO syn was the original factory fill except for early 964 which had 10w-30 TMO
20w-50
Just do some research as to the additive package, here you want ZDDP ~12-1300 ppm, more is ok, unless you care about the cat, but too much is also an issue, max ~1600+/-
going the other way is more of an issue but at least keep it above ~1000ppm
API SG was the category spec back in the day 964s were built, It's nla , so go by weight and additives