the oil is perfect!
1/2" may be a bit small. I have a 3/4" or a 5/8" return (i don't remember lol).
try it see what it does hopefully you'll have good luck.
edit: if you are running anything smaller than the 1/2" line there is no need to mess with anything else besides maybe cleaning out the exhaust housing. i can guarantee that is the problem.
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