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I buy filters by the case, but only keep oil on hand for one or two changes per vehicle. I can't buy Mann or Mahle filters at WalMart, and they're overpriced on Amazon.

Let's assume your car takes a full 10 quarts of oil that went up a full $10/jug and that despite having such a huge oil volume you run short 5k mile OCIs. That $20 increase per oil change works out to a huuuge $0.004/mile increase. Meanwhile if you're getting 30MPG, which is probably optimistic...

2013 Volvo C30 T5 (2.5L PFI Turbo 5-cylinder) with 188k miles OCI was 13,372 miles / 421 hours (assuming previous owner didn't reset the SRI without actually changing the oil) Out: Unknown sludge with an unbranded Chinese filter that didn't even fit properly in the housing In: 6.2 quarts of...

It's a nice data point to see, but it's a totally different operating regime than my own driving, and I suspect that is true for the vast majority of drivers. Both are important, but field tests that cover an operating regime closer to the average driver's routine are more valuable for PCMO...