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The first number is the cold temperature weight and the second number is the operating temperature weight.5w-40 just means it is the thickness of a 5w oil when cold (thick as cold 5w oil) and it is as thick as hot 40w oil when hot (while 40w is a thicker grade than 5w it is still thinner at this point because its hotter, but it is thicker than 5w oil when hot) so it doesnt CHANGE viscosity as much as straight weight oil.Vw specs 502.00/505.00/503.01 along with BMW, Mercedes, GM, Porsche and GM diesel are much harder specs to meet than the API specs and mobil1 0w-40 does meet or surpass all of these specs thin as piss.Ester synthetic oil is probably better than the PAO oils like Mobil 1, amsoil, etc. jmho It doesnt get thicker when its hot, it gets thinner of course, but it doesnt thin out AS MUCH as a straight weight oil.Why add lots of thickening additives if your oil is good enough to pass all the tests/specs for 40weight oil and still be as thin as skunk piss for fast oil delivery.You get the fast oil delivery to all bearings on cold or hot starts of thin oil and have the protection specs of 40 weight oil at WOT. Mobil 1 0w-40 pours like water and carries bearing loads better than most all 40 weight oils. This is why Mobil 1 0-40 comes in all new Porsche, amg MB, and Corvettes just to name a few.It's hard to dicipher sometimes the vague wording companies use but to give an example of an approved oil it states "meets key industry and car builder specifications for" and it lists the standards. Basically the ONLY difference between 5w-40 and 0w-40 is thethickness when cold.0w-40 will be thinner when cold than 5w-40, but they will both be the same thickness at operating temp.
Don't believe, please see for yourself: Amsoil is actually not approved. Unfortunately Amsoil is very carefull about their wording to avoid legal difficulites but what the clami is "has been reformulated for" and "is formulated to surpass" the specifications.
Mobil 1 0w-40 meets and beats all the specifications and test criteria for a 0 weight AND a 40 weight oil, without getting 'thicker or thinner'. Not bashing it at all, but it's not on the approved oil list because they don't submit to licensing for the standards. if you want more info, STFA BITOG and you'll find plenty of threads regarding amsoil's sketchy labeling and claims. Call Amsoil and VWOA and they will share with you and sort of info and documents that you require that it is approved. This has all been well documented and I agree it's very misleading.
Why add lots of thickening additives if your oil is good enough to pass all the tests/specs for 40weight oil and still be as thin as skunk piss for fast oil delivery. Your interpretation is way off, it has been approved by VOA and the other mentioned companies. Enough to have mislead people to believing they are certified. mike Modified by bhvrdr at AM 4-20-2006 Misinformation...school dino oil thinking 0w-40 oil starts life with a 0w base stock 5w-40 starts out with a 5w base stock From here on things get complicated for old school dino oil thinkers.
VI is from the formulation of the base stock oil, 0-40 does not get thicker, and it meets or beats all specs for 40wt oil being thin as piss. Amsoil doesn't actually have any of the certifications that it claims to meet. He states they "meet the standards" from their own testing but he stated, "You have to pay to get on those approved oil lists and we don't do that." Feel free to call and check.
It was explained to me that oil does not have to have a certain viscosity anymore to be classified as meeting specs, tests and regulations for a 40 'weight' oil. Plus, it has been argued that they can't possibly hold that many certifications because often having one cert, requires a certain additive level, which another certification requires less of. I posted a link in my orginal post about this from another member who also called.
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