sobiloff

I'm just passing along the word from my tribologist. Among the three C40 oils, the Mobil 1 C40 version has been performing the best in the applications he's seen. That doesn't mean it's a great performing oil in the grand scheme of things, nor that it's a Grp IV, nor that add packs are optional (?!), just that it's been doing better than LM and Motul C40 oils. I said I wanted to stick with a C40 oil in my GT4 (at least while I have a GPF in place, if not for the entire warranty period), so he said stick with the Mobil 1 C40 (and added the Grp III commentary about the other brands).

His tests cost more than $100 each, so he gets much more detailed data than a simple Blackstone test provides, and he's been an independent consultant to several OEMs, so I listen to him. I thought I'd pass along the word that I pay a lot for, but y'all can do whatever.

worf928

Cool. That's what I wanted to know: from where did your original assertion come.

mjw930

While I'm sure you are being transparent I need to see the data, otherwise it's hearsay. But regardless what the analysis shows, Mobil 1 C40 oil IS NOT readily available in the US at the retail point of sale AND a significantly large number of NA dealerships are still pumping A40 through these motors. If Mobil 1 C40 was readily available and dealers know their *** from a hole in the ground this thread wouldn't even exist. And while oil isn't something I'm willing to cheap out on, I sure as hell am not paying $20+ per quart, Mobil 1 has never shown that level of superiority over it competitors and is routinely considered a mid pack oil.

Westcoast

Or instead of waiting to top it up with oil that I could not get locally... simply change it with a fresh fill of Liqui Moly!

mjw930

Actually I'm leaning towards Motul, there seems to be consistent issues where LM has higher oil consumption than either Motul or M1 but for the most part oil analysis shows little difference between the 3. But that was just a cursory internet scan and I'll admit this is not the latest C40 variants.

I've used Motul before and have been happy with it and honestly I think unless you are tracking the car a lot the difference between the 3 is probably negligible.

steve9

Yea 70% still on the road, the other 30% made it back home in one piece.

mjw930

No, that’s Harley-Davidson and it’s 85% are still on the road, the rest made it home.

Sure, I’m a fanboy but the reality is prior to the SUV era and post non-galvanized era, Porsche has one of the best long term longevity stats on the planet. Of course you have to take into account that before 2003 Porsche barely made 10,000 cars / year on average so it’s a pretty small market sample.

Bill Mitchell

I recall when they first started hot dip galvanizing the body that they put one out front of the HQ building in Stuttgart, wonder if its still there?

mjw930

I don’t think so, I don’t recall seeing it when I was last there in ‘04. I heard it was in the museum garage though.

mjw930

SPAM - Reported

beemerb0y

any vendor or suncoast sell an oil change kit for the GT4 with oil, filter, o-ring, etc whatever else may be needed ?

GrantG

You probably could've found this in the time it took to ask your question, but here you go:

https://www.suncoastparts.com/produc...8GTFILTER.html

beemerb0y

no oil, o-rings, etc.. Im used to buying full on oil change kits for BMWs.. comes with the correct oil, the right amount, a filter, o-ring for the drain bolt, etc whatever else is needed

GrantG

Read it again! Comes with everything but oil (comes with filter O-Ring, but not needed on the included plastic drain plug)...

Bill Mitchell

Since they don't have the correct oil in their catalog its not possible to get a complete oil change kit, but if I recall correctly Suncoast has never included oil in their kits. I keep checking all the sites for the C40 spec oil but so far nobody else has added it.