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What's magic about the 75k-mile mark is that the OEM no longer has to replace the cat converter if it fails. I'll leave it to your own powers of reason to surmise what this might mean to the formulation of the oil . . .

OK. Thanks. Sounds like I'll need to re-think my approach to the problem.

Through a filter, that is. I'm trying to design a better, add-on filtration system for an obscure Italian motorcycle, which sucks its oil through a screen and then through the pump and to the rest of the engine. Are there any successful "suck-through" filtration systems, or is it just not...

I work at a motorcycle dealership that sells Moto Guzzis, which have a very automotive-like oiling system. We had a bike come in with the oil light coming on. We checked it and found the rubber gasket blown out on the filter, so we replaced the filter. That one blew, too, and then a third, in...