Quote:
Originally Posted by 64speed
It’s an LS so it’s made for synthetics. I have heard how great brad penn is so I thought I would give it a try. I have been running synthetics for over 355000 miles now with no leaks but I figure it’s getting some miles on it and may try a thicker oil. I haven’t lost but about 3/5 pound of oil pressure over cruise speed in the last five years so I guess I’ll just stick with what works
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Considering that 5W30 was the spec oil for this engine, 10W30 or 10W40 would be "thicker". 20W50 for an engine designed to run on 5W30 is overkill.