Good idea and one reason I've also went from a 5W-20 to 5W-30 even though it's not a DI engine design. All engines fuel dilute to some degree, but I mainly just want some HTHS viscosity headroom for added protection when I really get on it.
Another "Taxi" Study: Relationship of Engine Bearing Wear and Oil Rheology 872128
- Thread starter AEHaas
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For me, it's the graph returned by googling HTHS wear graph.
As a 20 weight shears below it's virgin HTHS = 2.6, engine wear increases exponentially, so 20 weight oil has no cushion to compensate for the sheering and fuel dilution that happens during an oil change interval.
30 weight oils have the cushion to compensate.
ZeeOSix further explained why MOFT (film thickness) plays an import role in that.
But do we have any scientific studies to prove our hypothesis to convince those who prefer the ultra thin oils even in older engine designs.
haha - you can drive my car as reasonable as you want and will see oil temps above 200 the whole time....225 or so on the highway in summer.
It would be great if we could have some kind of Oil Monitor on the car that would show when the oil has 2 much fuel or it thins out 2 much.
I'm sure that xW50 is also shown for "track use only" or similar?
OVERKILL
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Nope, it just spec's 5W-50.
It's really as simple as doing a few UOAs and getting a feel at what mileage/use that happens.
Not an 0W20, but possible could end up as a 10W.
What's interesting to me is that the Toyota GR Supra runs 0W20.
OVERKILL
$100 Site Donor 2021
Corvette of course now spec's 0W-40 (and I THINK 15W-50 for the track still?)
Fuel dilution, for me, is what drives OCIs on several of my vehicles.
I don't think Toyota (or maybe I should say BMW?) specs a different oil for track use in that Supra.
0W-20 is the thickest oil Toyota recommends. Nearly everything else is 0W-16 or 0W-8 with 10k OCI and "adequate" pressure oil pump.
Also factory speced for the GT350 and GT500 ... and their bearing clearances are really no different than the Coyote.
OVERKILL
$100 Site Donor 2021
2022 M5 calls for LL-01 FE 0W-30, lol.
I'll be a 2-day HPDE event at VIRinternational Raceway in a few weeks....I'll make sure to poll the group "What oil are you using?"
it's called an oil pressure gauge
Toyota GR 0w-20 is different than TGMO. it is a ACEA C5 rated oil. The two engines put in the Supra are BMW.
https://parts.elmhursttoyota.com/p-...-3-0l-oil-change-kit-oil-filter-grsupraoilkit
From the Toyota GR Supra OM. Note API 0W-30 ... but only up to 1 qt ... pushing CAFE man, lol. Also note OM comment about track use ... so of course they aren't going to recommend a certain viscosity for "track use".
Then put in something thicker than 0W-20.
5W-40 in the real race car version.
https://www.blauparts.com/blog/toyota-gr-supra-gt4-to-race-using-ravenol-lubricants.html
https://www.blauparts.com/blog/toyota-gr-supra-gt4-to-race-using-ravenol-lubricants.html
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