Quote:
Originally Posted by TheRuss
I'd disagree. From used oil analysis it has been shown that the N54 dirties the engine oil much quicker than the 20k interval. (Mainly from fuel dilution.) I'd definitely not wish to leave my engine oil that long.
As for Trans fluid, regardless of standard intervals a fresh fluid is always better than a dirty one. It's up to the individual to weigh up a cost vs benefit basis on how often they want to change it. It's impossible to know if it's worth it, but I feel better with fresh fluids in my car.
Same goes for the engine oil. The car may not break down if I leave it to 20k intervals, but there would likely be more wear.
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Who said anything about a 20K interval? I would certainly believe that oil in the pan for 20K would have more contamination than one in for 10K, but what is the point? BMW says once a year or 10K whichever comes first also the same schedule as MB and nearly all of the industry.
I have yet to hear of any engine failing due to following the mfg recommended schedule. Most of the stuff mentioned in this thread regarding intervals is pure nonsense not supported by any auto maker or scientific evidence. In fact, studies support the idea of extended oil changes.
Urban legends, old wives tales, the grizzled geezer, oil forums, or whoever has been spreading this rubbish around for years. All of these oil changes are at best described as anal and a waste of precious resources.
