Wow you're very conscientious and savvy with the bargains.
How often do you change car engine oil filters? Are you one who will change them every time regardless how much distance was covered?
Do you go for most expensive filter or cheapest?
With my Laser 1.6 I change filter every second time because I discovered all the old dirty oil will actually drain out and there will be non trapped behind the filter and I don't reach anywhere near the recommended oil change distance, whereas with the 302 V8 more oil drains out as you loosen the filter. after the sump is done draining.

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!