On 24-03-2021 02:03 Paul in Houston TX wrote:

Where do you get full synthetic oil at API SP quality for ~$2.50/quart?

I get mine at Walmart for ~$3.10 per qt.

Thanks for answering that as I also tried Walmart but found, like you did,
that the prices are higher than at Costco (even before Costco sales).

I get the oil filters at an auto parts.

Nice thing about Auto Parts Stores is they have a choice of brands.
Wix (aka Napa Gold) seems to fare well when people cut them open.

At Walmart the Fram always fares poorly (cardboard tops & bottoms).

The Mobil 1, K&N and even the low cost SuperTech store brand come out
differentially depending greatly on the point of view of the reviewer.

At parts stores the Bosch (aka Purolater, Boss) come out ok with the AC
Delco being not much lower in build quality (lots of these are made by the
same outfits as can be seen by the exact construction in the tear downs).

As with oil, with frequent oil changes the filter paper itself matters less.
Even so I try to find 20 micron (not 30 micron) 99% efficiency filters.
It's harder to find coil overpressure springs than plastic (or none at all).
Usually orange anti-drainback valves are silicone (versus nitrile black).

What do you look for?