yea, just joined the list, and the date looked like 07' before I posted, then thought someone had info.
Just getting into oils seriously with a new car. Had old cars for a while, and high mile wagon I got from my BIL to carry my hounds around it. It was missing a freeze plug and had to run water in with a hose to hear it run, and it was using a qt/100 mi from leaking valve cover gaskets, and was super slugged up from short trips. Had a valve tap and I tried an additive, and plugged up the oil pump pickup screen. I thought the pump went bad when the oil light came on. Changing the pump would have been a big job, and since the additive seemed to cause the problem. I thought sludge. Could see the pickup screen through the drain hole, so decided to try to bypass it, drilling a hole into the screened cup, and back flushed it. Got pressure and drove it for 6 more years.
I want to keep my 22 yr old Chevy running, and want to do the best for the new car oil wise, and thinking I could reuse the oil from the new one, if the better ones last as long as claimed, and have the best of things, since the new car gets little and all highway use. Looks like oil is more complicated than I thought.