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We've converted 5 of ours to spin-on, the first one in 1977. Results have been much better - no cocked cannister or twisted o-rings to leak, no filter sitting in the botton of the cannister because the spring got misplaced..... (or, in one case, installed on top of the cartridge...!). We've used many brands of filters, with no apparent differences. I say apparently, because poor filtering could take years to show up, especially if you're careful with cleanliness, and change oil regularly. There was a web site comparing different oil filter cartridge manufacturers. The chap bought a dozen brands of a particular filter, opened them with a lathe, and found that Fram had 25 to 30% less filter paper area than most others (and Fram makes several store brands, I understand...). The website is no longer around. (It occurred to me that possibly a manufacturer used some strong-arm tactics on the gentleman.... but then, I tend to be cynical at times... businesses are alwaye ethical.... aren't they? I also enjoy stories starting "Once upon a time"...!!!) The filter for the VW gas engine fits the MF adaptor perfectly. It's a half inch shorter than the MF filter, and a quarter the price.
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