My brother use to work for Purolator. He was the guy who ran the machine
that tested filters off the production line to check for specs. (filtration
levels of particulates). He said Purolators were good filters (though this
probably doesn't account for various levels in the product line).
According to my brother Caterpillar once set a (very high) spec. for
filtration and wasn't happy with what Purolator offered. They went looking
elsewhere and eventually returned to (and accepted) Purolator. There does
seem to be a quality issue but I'm not sure how it all "filters" down (pun
intended) for the average motorist.
Tom Witt
> I've heard that said of Fram over the years, as well as others.
>
> Last year our club took a tour of Ethyl corp here in Richmond. They make
all
> the additives(among other things) for the different gas companies. That's
a
> story for another time. They have room after room of engines running on
test
> stands 24/7.
>
> This question of oil filters came up and the Ethyl rep advised us that the
> path through the oil filter on almost every engine made is optional. There
> is a bypass in case of a clog and to keep oil flowing when some owner may
> never change a filter. Also, it helps keep your oil pressure up. Like all
> fluids, he stated, oil flows in the path of least resistance. Too many
> filter layers (read more resistance) can result in less oil being filtered
> on each pass. His advice, buy whatever filter they have in stock, the most
> important thing is to change it every oil change.
>
> I still have a favorite brand, but if they don't have it, I take his
advise.
>
> Travis
> B9472584
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