Quote:
Originally Posted by 97Formula
What about using a different brand of 5w30 oil? I did a google search and have seen quite a few stating that 5w30 Mobil 1 in particular is one of the "thinner" 30w oils (some say it's actually too thin for LT1 cast iron blocks).
Should I step up to Mobil 1 0w40?
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I think used to run Mobil 1 15W40 or 20W50 in the summer months on my old 93 Pace Car when it had the supercharger on it. I think I ran 10W30 or 10W40 in the winter. I know 5W30 made a lot more noise so I went up to a heavier weight oil. And you could always tell when it was time to change the oil as the ticking or piston slap at start up would get louder over time.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
Last edited by JL8Jeff; 01-05-2020 at 09:50 AM.
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