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Join Date: Dec 2005
Location: MD, the other Bay area
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After thinking about it for a bit, my concern would be oil pressure. The 40 weight oil is going to cause higher oil pressure at operating temps, which might pose a problem to the aging valves/seals/etc.
I've seen the VQ dipstick called "the Rubik's Cube of dipstick designs". I thought that was pretty concise.
As per diesel oil, the TBN is typically higher on those and many people have converted to using diesel motor oil including the synthetics. TBN range is 6 to 14 and among additives, is the measure of how long you can run your oil based on a test for TBN after xx miles of use.
If you are not interested in extending the oil change frequency, it's really not a big deal but in any case, you can have any motor oil sample tested just for the fun of it.
My preference is using Rotella in my motorcycle (syn or regular) because it's safe in the wet clutch whereas many other typical motor oils have additives that can fuss it up. Buying a m/c specific oil is as expensive or more so than the Rotella T Synthetic, so that's a no-brainer.
For the car.... In my case, the cost/benefit of more expensive synthetic oil and longer intervals versus normal priced oil used in the 3000 to 5000 mile range is not any difference. I'd rather have a fresh filter/fresh oil at that point anyways. If I were racing the car or really stomping on it more often, I'd go the synthetic for cheap insurance if nothing else. Part of my decision is based on my free dealer oil changes.
I go in at 3k everytime just because.
How often you change oil at your g35?
Is it synthetic you are using?
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