I read that Purolator’s ML line is actually made overseas by another company and is inferior in quality to the PL Pure One filters….
You received correct information.
it is likely that Purolator’s warnings for PL filter use in MCs is simply a marketing ploy to prevent competition between their PL and ML filters.
There is some debate on that, and as I posted before, the ML line of filters have a lower bypass activation pressure then their identical car PL filter.
Anyone with the oil filter testing results mentioned above??
I don't know how it works in the USA, but in Canada we have the Consumer Protection Act (similar to the Magnuson–Moss Warranty Act in the USA possibly?). It states that a manufacturer can not deny your repair or coverage based only on a suspected cause of damage. They must prove that the item which they are blaming for the damage, actually caused the damage.
Not bike related, but I had a steering pump explode on my almost brand new 2004 Pontiac Grand Prix GTP compG. They blamed it on the nitrous system I installed. I told them to prove it. They initially said the insane torque steer (no argument there, lol) caused more stress on the pump (lol). I said have it tested, and prove to me that the steering pump is under more stress from torque steer than it is when I'm pulling 0.81g on the 300ft diameter skidpad.
I guess they made a few phone calls to an engineering/data capture company and found out it would be way cheaper to just fix it, rather than do the testing!
Flex your muscle. No way a "not completely dirty/plugged" PL oil filter caused ANY difference in the oil pressure or flow on your bike. I'd bet my life on it.