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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I agree. People fail to realize that during initial break-in period on your engine/trans/diff, metal levels are much higher than normal. I think it is definitely good to flush them out.
Really, people need to base their OCI based on how they drive and a UOA. From what I've seen, the N54/N55 breaks down oil relatively quickly, so an OCI of 5-6,000 miles would be my recommendation. If you drive nothing but highway miles, I could see going longer like 7,500 miles or so.