Since you paid someone to work on it, if its not right, take it back. i say o-ring as well. might as well put a hp/hv pump in at the same time.
My stock ls2 gets down to 20 with 5w-30, stock oil pump, and feeding twins.
How hot is the oil is key. 225 is good, 300 is hot.
-Carl
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Dark Aladdin
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