That 15w would hardly matter here in SoCal. And I don't really know if the extra 10 in the upper range would help all that much in the heat. I'm sure it would do something, but there are theories that you would also get a little extra engine heat from the thicker oil, and possibly a little worse MPG.The master Saab mechanic here in LA swears by 15W50 in our climate. He's got a wall of it and uses it on every Saab he's serviced.
Well, they claim they are licensed for API purposes and that that oil is approved for SJ-SN service applications. So that looks just okey-dokey, smokey.What you are saying is that we should religiously use Wolf's Head Syn-Pack 100% synthetic 5W-30 every 5,000 miles.
And then they say:Wolf’s Head 100% Synthetic Motor Oil has been carefully developed to meet the most current API Service Classification. Wolf’s Head 100% Synthetic Motor Oil is formulated to meet or exceed all new car manufacturers' warranty requirements as well as stringent industry standards such as API SN/CF, ILSAC GF-5 and meets most European ACEA specifications.
So, so far, so good.Wolf’s Head 100% Synthetic 0W-20, 5W-20 & 5W-30 dexos1® are specifically engineered and licensed to meet the stringent GM dexos1® engine oil specification, as well as all of the specifications outlined above for the Wolf’s Head 100% Synthetic motor oils.
This! +1 If you aren't interested in really long OCI's and do it regularly...then use M1, Pennzoil Ultra Euro, Castrol... ect. It doesn't matterGM-LL-A-025GM approval for extended oil change intervals in petrol engines up to 30,000 km or 2 years and improved fuel economy. Meets ACEA A3/B3.
GM-LL-B-025GM approval for long-life engine oil for diesel engines. Meets ACEA A3/B3/B4. Drain interval can be as long as 50,000 kms.
From GM's dexos™ site:
dexos™ is recommended by GM for use in all its vehicles except those with Duramax diesel engines requiring the use of API CJ-4 engine oil. dexos™ is fully backward-compatible and can be used in older vehicles.
- dexos1™ is designed for use with gasoline engines and replaces GM-LL-A-025, GM6094M and GM4718M.
- dexos2™ is designed for use with light-duty diesel engines and replaces GM-LL-B-025 and GM-LL-A-025.
dexos1™ approvals currently include ONLY these multi-viscosity ranges: 0W-20, 5W-20, 0W-30 and 5W-30.
dexos2™ approvals currently include ONLY these multi-viscosity ranges: 0W-30, 5W-30, 0W-40 and 5W-40.
So any multi-viscosity oil in the XW-40 range that previously met GM-LL-A-025 for gasoline engines, like the Mobil 1 that did, CANNOT now qualify for dexos1™ approval, which is for gasoline engines.
So, in order to make the standards truly, or at least seemingly, backwards compatible, GM had to kind of mix them up a little in the translation. Accordingly, the previously approved for gasoline engine use (GM-LL-A-025) multi-vis oils in the XW-40 ranges must now be excluded from the dexos1™ standard (which is for gasoline engines and which does not approve any XW-40 oils) and MUST be included within the dexos2™ standard for diesel engines, since only the dexos2™ standard carries approvals for oils having that multi-viscosity range.
The only thing that makes sense is that GM wanted to keep extended drain intervals AND it wanted to further incrementally increase corporate average fuel economy. Gasoline engined cars limited to 0W-20, 5W-20, 0W30 and 5W30 will get a little better fuel economy than those opting to use 0W40 and 5W40.
Once again, following GM/SAAB recommendations and approvals now is fruitless, pointless and unnecessary from a warranty standpoint for very nearly all of us. You can use a mixture of olive oil, candle wax and donkey snot now if you want, cause you ain't got no warranty if your car is out of warranty.
If your concern is the health and longevity of your engine, forget about "GM-LL" and "dexos™" and use whatever quality synthetic you want, in whatever multi-viscosity range, from 0W-30 or 5W-30 or 0W-40 or 5W-40, that meets the relevant industry performance standards (those established by API and ACEA), and change it regularly and not based upon some robotic algorithm that assumes you are using something that meets or exceeds GM-LL-A-025 (which again, is ONLY important if you are trying to avoid changing the oil more frequently than every 10,000-15,000 miles, or whenever the computer insists that you change it, whichever occurs first).
Seriously, I doubt there is any big name synthetic out there right now that is able to comply with the applicable API and ACEA standards but which would have been unable to comply with the GM-LL extended service interval requirement, had the manufacturer decided to pay for that particular proprietary approval. And, if there are some out there, it DOES NOT MATTER if you follow a set service routine like your daddy did back in the dark ages and change it around every 5,000 miles or so and write it down and do it all over again on time.
Besides, who really wants motor oil in his engine that is as black as the heart of a politician, contains more dirt than the closet of that same politician and that is clogging up that poor, teeny-tiny little fragile paper oil filter because it is so old and saturated with suspended crud and dirt? Not me, man. Fresher cleaner oil will always give more flow from the git-go.
OK so this makes sense to me. I change my oil every 5k anyway.The cars are out of warranty anyway. Use a good synthetic and change it regularly. The Obsolete GM LL specs were primarily concerned with extended drain intervals. If you don't like 0W and 5W 30 oils, there are plenty of 0W and 5W 40 oils that will perform splendidly. Just change it regularly.