TA via CarKB.com said:
TeGGeR:
I don't sweat to spend extra few bucks, I posted my questions on this web site to give myself a chance to absorb the right knowledge from experienced, knowlegeable people on the same issues. I am truly appreciated your advice. Thanks again! Of course, I am very appreciated your advice.
You've heard from others regarding the viability of longer change intervals. I remain unmoved from my "severe" approach.
I do not regard Consumer Reports as a credible source on this issue, given their leftist, environut mindset.
My take is this: Engine rebuilds are very expensive. Oil changes are cheap. If you only plan on keeping the car less than six years, change the oil once or twice per year and forget about it. If you plan on keeping the car forever, and for very high mileages, change it much more often than that.
Insufficiently frequent oil changes cause sludge buildup. Once sludge establishes itself, it's there for good. Sludge interferes with lubrication, ventilation and cooling. It accelerates wear, especially in the top end.
The primary source of cylinder bore wear is acids and fuel in the oil. The acids and fuel micro-etch the surface of the cylinders, and wash oil off the walls, so that when the rings first sweep over them at startup, there is more abrasion and thus more wear than there will be on subsquent sweeps. Keeping acid and fuel buildup to a minimum reduces bore etching and wear.
Acids, fuel and soot also attack the oil seals. Frequent changes reduce the concentration of contaminants the seals are subject to, increasing their lifespan as well.
I don't care if I'm "over-maintaining" my car. Better that than risk the opposite.