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Those Stainless steel serviceable oil filters are starting to look a lot better now aren't they.
Only to an idiot.
Bypassing doesn't mean lower oil flow when it's cold or any other time, just that it doesn't all go through the filter every pass, and that's nothing to be scared about under normal circumstances. When a filter is used for a while and the pressure drop across it starts to rise, it actually gets better at filtering, so even if you take it to the limit and the bypass valve starts to let some oil go around the filter, that oil will eventually pass through and be well filtered.Bypassing doesn't return the oil to the sump, it just lets some avoid the filter.
I would think the by[pass feature is for when the filter is full of crap and needs replacement.
Within the last week got 2 UFI filters for my Norge from MG Cycle, installed one of them yesterday after carefully inspecting both of them. Absolutely nothing amiss on either. They both indicated made in Tunisia. I have been using UFI filters exclusively for over 40 years and 400,000 miles, never had an issue of any kind. Nor has any of them ever come with a washer, just the rubber gasket shown in the pictures. I will continue to use them absent additional evidence. Making oil filters is not exactly high, or even medium tech, and I see no reason why for something like this I would trust, say, Roumanian sourcing more (or less) than Tunisian. Seen plenty of examples of crap from supposedly more advanced places like Italy (the late '06-early '07 Norge oil pump rotors), Japan (auto air bags), Germany (BMW bike rear end bearings), France (early Valeo starters), plus all kinds of stuff from China-or the US. I think these might well be counterfeit.