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Supercar 0w40 and Supercar 5w50. Mobil says on their Supercar oil website that "For those with a Corvette model produced before 1993, we recommend Mobil 1 15W-50 for both street and track use." fwiw - I'm not asking for advice on what to run ;) But, if you want to know what oil Mobil...

Xw40 or Xw50. I personally prefer 18cSt. The reason for no elevated wear metals in my last UOA with high Si? Possibly 20 micron filtration coupled with 18cSt "abrasive particles equal to or larger than the oil film thickness will cause wear". I'm sure that can't be true. It really doesn't...

If choosing between Mobil 1 5w30 and Mobile 1 10w40 HM, or Amsoil Signature Series 5w30 and 10w40? (actual oils 80s/90s Corvette owners choose between) 10w40 every time

Adequate Oil = will safely get an engine thru the warranty period. Optimal Oil = provides a level of engine protection that significantly extends the like-new performance life of an engine.

False. CAFE is a consideration with every vehicle oil recommendation. The 5w30 viscosity is unchanged from the late 80s. The people who designed the Corvettes then didn't use that viscosity in their own Corvettes in the 80s and 90s. Now those Corvettes are 30+ years old. You can take a stab at...

I didn’t suggest they are. The Corvette Development Team Leader specifically said 5w30 weight was recommended because of CAFE. And that he did not use 5w30 in his personal Corvettes. If you want to start another discussion comparing oils from the 90s to todays oils - that’s fine.

That has nothing to do with this thread. Probably five different BITOG veterans have chimed in to say basically “30 weight is all that’s needed for this application”. So I directly asked the leader of the Corvette development team about viscosity and CAFE in this specific application. And he...

Fwiw - yesterday I asked the person leading the Corvette Development Team about this: https://bobistheoilguy.com/forums/threads/viscosity-cafe-q-a-w-corvette-development-team-leader.373035/

Also

I asked Russ Craighead, who led the Corvette development team for GM, through the C5 and C6 programs, and Russ also owned four C4s. Question: Hey Russ, here’s a quick question that of the people I know - you may be able to answer. When my 92 Corvette came home from being built by...

Molasses FTW! Callaway slaps a twin turbo on a L98 Corvette and requires molasses. Requires it!

Fwiw - when I posted that T4 / Lucas combo is what the prior owner used, even without a UOA, BITOG judgements and conclusions were everywhere. Now we have a good looking UOA and … we know for sure that anything positive about this UOA cannot be attributed to T4 or Lucas. I’ve learned you gotta...

These are all made in Fayetteville, North Carolina. Did you do a post of the MX you cut open?

Just realized I didn’t include the second half of the UOA sheet in the original post.

Fwiw - when I got this car I shared that the prior owner used Rotella T4 15w40 with Lucas in this thread: https://bobistheoilguy.com/forums/threads/rotella-t4-15w40-lucas-in-a-93-corvette-autocross-race-car.372414/ True to form, BITOG folks slammed the prior owner for choosing that oil and...

Got UOAs to validate that?

What part of my post are you referring to re “that just simply isn’t the case”?

fwiw - that UOA was 4.5 quarts of Rotella T4 and 1 quart of Lucas oil stabilizer. I am sure some of the additive dilution was caused by the Lucas.

I’m pretty sure that was the first time I mentioned cSt in this 5 page discussion. Referencing T4 + Lucas as “just over 18” simply shows that the combo results in a verified 50 weight oil. Fwiw - here’s the HTHS of the 2 oils I’m using: M1 15w50 has a HTHS of 4.5. And the HTHS of Supercar...

It doesn’t seem to consume 50 weight oil. I’ve only owned this car for 6 days tho. The Prius example wasn’t necessary. It just illustrates that 30 was the still the baseline 17 years ago and bumping up a viscosity grade has no negative effects and it reduces oil consumption. It also reduces...