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Message: [QUOTE="TARM, post: 369522, member: 578"] This is true but at the same time you do have to understand that the farther apart the winter or cold viscosity rating is from the standard or hot viscosity rating the more viscosity modifiers are used. The modifier get used up much faster than the base oils viscosity. This is why you see such a quick drop in viscosity. This can worry some people. But if high quality base oils are used this will tend to level of and the rate then slows dramatically to where its not an issue with anything considered a normal OCI. Take two syn oils same quality one 15w40 and one 5w40. The 5w40 will have a larger initial drop than the 15w40 will. But after that they will both decrease from that point the same all things being equal. IMO as long as that initial drop does not take you outside a viscosity that is recommended for your motor all is good. 30w IMO is perfectly fine as long as the other parts of the oil makeup is good. All the Schaeffer's oils are from some of the best base oil stocks available and IMO have some of the very best additive packages of any oil. [/QUOTE]

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