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Old 01-09-2001, 08:14 PM
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...back to my question about Mobil 0-30 and longstons mention of Lubro Moly "Voll-Synthese" that is 0W-40. Are we to believe that high grade synthetics are being produced with a less than advantageous quantity of "dreaded VI additive" ?????
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Old 01-09-2001, 08:27 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
I guess that is a yes. MB now recommends only synthetic oil(1998 & later engines) & Mobil 0W-40 is one of the listed oils. That is the weight oil that all AMG engine powered cars come with!
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Old 01-10-2001, 07:15 AM
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That was something that entered my mind when I saw "OW 40". But I have only seen this in a synthetic. I expect that the use of VI additives in synthetic oil is a different ball game due to the superior behavior of synthetic oil at high temperature.

I have absolutely no data to back up this statement, it's only a hunch.

From a practical viewpoint, I think that there would be very few people in need of such a weight spread. I suppose if your drive included a run across the desert at 110 degree F ambient, followed by climbing the mountains into -20 degree F ambient, there would be a need for such an oil. I would expect this to be a need for much less than 1% of drivers in the world.

I just would not see where this would be a need. If you're in Alaska, use 0W 30, if you're on the equator, use 20W 40. With a synthetic, 10W 30 would probably work on the equator quite nicely.

Good luck,
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