Quote:
Originally Posted by Gunmetalmissle
The 1 liter euro spec oil is being used to provide availability to Corvette owners prior to the full release scheduled for 3rd quarter 2018. It is Dexos 2 as clearly indicated on the bottle but not exatly the same, based on the specs, as the new formula which is also Dexos 2. The 0w40 fill caps are being produced in both dry and wet sump versions. So presumably, as indicated in the press release, the new formula is for all LT1 and LT4 engines.
As for why the ZL1 1LE still specifies 15w50 for track use, it will likely see higher temperatures. It can start accelerating earlier and brake later, meanwhile the engine must work harder to overcome the extra aero.
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Interesting point re the aero but stickier tires have never led to higher operating temps in my experience. Seems very heavy oil especially if someone runs it in cold temps start wise. But i am sure GM knows what they are talking about and why.