Today was restock day for me. I'm still a miles or months guy, and I guess it works given that I haven't lost an engine yet.
I try to keep to engine families for my rides to keep interchangeable fluids. I've got it down to 4 sets:
My 3.8 buicks use 10-40 grade, one got it since 1983, always quaker state conventional. More recent years its a high mileage conventional with an additive, and the other 3.8s got on the same regimen.
The 3.7/5.0 mustangs both use the same Motorcraft filters and synthetic blend 5-20 oil.
The 5.0/5.7 Chevys use one filter, the i6 250 another, but all are running a 15-40 diesel grade oil,
The 496 is an outlier being one of a kind for now, getting its 5-30 blend, but, I expect to add another when the right one comes alone.
But was running low on oil, ended up dropping $276 and change on 50 quarts, including I grabbed a half dozen oil filters because the price was right. Sounds like a lot, but when you're using 6 - 7 qts per change it goes fast.
Sometime this week or weekend the yukon, a pair of the mustangs, and a pickup are due. The other half of the drivers will get their shot another week. 4 oil changes and systems checks will be more than enough for one day, especially since I've got to delve into a solenoid issue and dig into the a/c on one of them.