quote:
Originally posted by moribundman:
If M1 Truck and SUV 5W-40 is really D1, why don't they carry the same approvals?
Anyway, should I give the M1 Truck and SUV 5W-40 a try in my Audi sports sedan? 5W-40 is a recommended vicosity for the 2.8, but I'm still wondering if an oil designed for diesel motors is really optimal for a gas engine. D 1 has no friction modifiers, right? And does it even matter to a gas engine that a diesel oil will hold a large amount of soot? Supposedly CI-4 rated oils can neutralize large amounts of acids, and they are designed to last 30k miles in trucks. Sounds like a robust oil to me. So, should I give it a shot? I'm due for an oil change.
PS: heyjay, thanks for the explanation on CI-4. I actually found some info on the various diesel specs.
First of all, heavy duty diesel engine oils contain plenty of friction modifiers, especially Delvac 1 5W-40. Heavy equipment linehaul operators are VERY concerned about fuel economy and even a fraction of a MPG adds up to huge yearly savings.
In most tests, Delvac 1 will add from 3-7% to a HD diesel operating economy. I've had similar results in my equipment, whether you calculate in MPG or gallons per hour or whatever.
If your Audi 2.8 recommends a xW-40, ask your local Audi/Porsche dealer. Although a lot of folks are mystified by D1, some are aware it's a superior oil for HD diesel and most gas motors.
If Mobil is targeting the "light" truck market, they're not going to worry about listing HD diesel specs. I think that would confuse the average North American oil buyer.
After all, we've been raised on this API/SAE nonsense where they claim that all oils are the same, especially that "Starburst" garbage. Completely unlike the European ACEA process.
And if this really is a rebadged Delvac 1 5W-40, the price per quart works out about $1 cheaper than buying Delvac 1 in the gallon jug, and about 50 cents a quart cheaper than buying Delvac 1 in the 5 gallon pail.
I think that would really offend a lot of HD equipment operators, like me. However, since I need to "prove" I'm using the correct oil for extended warranty, I'm over a barrel.
Yet the Mobil 1 "Truck and SUV" DOES have mention of CI-4 and CH-4. I'm going to ask my Cummins tech rep if they'd go for it. Cummins also wants to see testing to their own CES 20078, CES 20077, CES 20076, etc and will grant approval based on the published CES results.
This would save me about 50 cents a quart if I could use the Mobil 1 SUV and Truck instead of Delvac 1. That may not sound like a lot to you folks, but do you have any IDEA how big the sump is in a large Cummins motor??
Jerry