Oil
#4
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#7
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For many, many years, people defaulted to Mobil1 5w30 as it was OE with the Corvette LS1. You'll find in the links above and with a search there are more and more switching to other types of oil.
Personally, I will be switching to Valvoline 20w50 conventional racing oil at my next oil change.
Personally, I will be switching to Valvoline 20w50 conventional racing oil at my next oil change.
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#12
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My SS w/70k just had the bottom end rebuild so I'm using M1 5W30. My Z28 is at 140k w/unopened bottom end and it uses M1 10W40HM. Its not necessarilly what oil you choose, but I would highly recommend sticking with one brand. You can go heavier/thinner between seasons but if you used Mobil, keep using Mobil. Castrol, keep using Castrol, etc. There is NO best of both/all worlds engine oil.
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In regards to oil type, I wouldn't apply the same level of concern to a stock cam as I would to a fast ramp, high lift aftermarket cam. A stock roller cammed engine will do just fine with almost any off-the-shelf oil that is changed at the correct interval for the oil/usage, and is maintained at the proper level.
#17
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You dont even NEED a synthetic unless I am mistaken. To my knowledge most if not all LS1 F bodys were filled with conventional from the General..
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Synthetic isn't required for modified engines either, and just the simple fact of being a synthetic alone won't substitute for inadequate zinc/phos (ZDDP) content for an application in which it's being used.
There are both conventional and synthetic oils that are racing/specialty blends with high ZDDP content for applications requiring such oil. Stock roller cammed applications are not usually examples of such - any off-the-shelf oil should be fine for those.