That is an interesting opinion. There are countless examples of vehicles that are "neglected" but still seem to last a tremendous amount of time and miles, but that might not be the cause. I have wondered about this.
Why do you have this opinion, other than your personal experience? Do you theorize that the oil, (which is in longer use) suspends contanmination and perhaps uses it as an "ultra light cleaning booster"? Or something along those lines?
I was trying to make this point - that using only the OCI, and ignoring other factors, leads to specious conclusions.
The personal experience is true - I had a sludged engine, that got 5,000 mile oil changes. Absolutely true.
And that conclusion is wrong - it wasn’t the short OCI that led to problems. It was a combination of factors.
Clearly, oil is not oil (as some have recently claimed) and specification matters. The engine itself needs a better quality oil than was being used by well-intentioned “mechanics” who used 15W40 conventional in a Volvo engine. Wrong spec. Even though it was “good diesel oil, with more detergents” as the owner was told.
Wrong oil, at short interval resulted in sludge. That’s the XC-90.
Same engine in the 2002 V70T5 - long drain interval with the right oil = no sludge.
Identical engines, so, we have controlled for that. Both engines see a mix of in town and highway driving. So, no difference in use. Both in Virginia Beach, so, no weird climate differences. Yet, here is the result of identical engines with over 200,000 miles:
Short interval on conventional = sludge.
Long interval on A3/B4 = clean.
I find this entire discussion of oil change interval, in isolation, without regard to engine, operating conditions, or oil specification, to be mildly ridiculous. So I posted a true example, which ignored those same factors, and the result is, well, mildly ridiculous.
If you take things out of context, and you fail to account for a multitude of variables that influence the outcome, then the result is pointless.