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Margin of profit too low to push? It is not how good the oil is, it is how much per quart they make for profit. Pushing a low profit oil might undercut the bottom line; just my guess.
That is way too cynical for me...some people have no faith and think every corporate guy is Enron...too bad. Dude there are many people out there who actually give you their best advice for thier product based on years of research and trial and error. But just because the maker of GC doesn't tout the same fantasy as some of the guys here about some discovery that a 0w30 oil is the end all doesn't mean they are wrong or dishonest. In fact you guys should provide actual proof before you level a dishonesty rumor against anyone. JMO.
I guess the real question is why does Castrol recommend 5w30 for my BMW 740il when it isn't BMW Longlife (LL-01) approved? GC 0w30 IS BMW longlife (LL-01) approved and yet it isn't recommended by Castrol. Makes no sense.
BMW also recommend 0w30 oil in my Owner's Manual and specifically state that all oils used MUST be Longlife approved (LL-01).
Based on that - and the outstanding UOAs reported - I'm using GC 0w30 exclusively. I have no doubt that it's the best oil for my 740iL.
I am baffled as to why all the european OEM's who make really great engines...want 0wxx and the US Auto OEM's specifically say 5wxx...and when you talk to the US guyus they are really adamant about that fact that they believe you are going to screw your engine with 0w oil. SO all I can say is you are going to have to trade me your BMW for my Yukon.......
I'l even throw in 100 qts of 5w30...
With the cold weather and snow we're getting up here north of Toronto, trading my BMW for your Yukon might not be a bad idea. Of course, I use 0w30 in my BMW so I expect the engine is ready to blow at any moment...(LOL).
As others have posted, I suspect the main reason North American manufacturers continue to recommend 5W is for the simple reason that it is widely available as a dino (mineral) oil. 0W formulations are almost exclusively synthetic. Given the choice between 5W dino oil and 0W synthetic I'll take synthetic every time.
Further, if you go to the Mobil 1 website and check the viscosity ratings for their 0W-30, 5w30, and 10w30 you will see that the 0w30 has a slightly HIGHER viscosity at 40 deg. C than the 10w30. That's right, at 40 deg. C the 0W has a slightly higher viscosity than the 10W.
Note also the GC 0w30 has the highest ACEA A3 rating which designates a "high performance oil" with outstanding HTHS results. Castrol Syntec 5w30 doesn't have this. The A3 rating, to me, is the single most important spec I look for.
I don't think you can dismiss the dozens of UOA for German Castrol that show remarkable low wear. That isn't theory, it isn't conjecture...it's real-world testing of oil that has been used for thousands of miles.
You have raised an interesting debate and there should always be room for dissenting opinions. IMHO German Castrol 0w30 is the best oil available for my BMW...and it's going in my Ford Explorer next.
