Your last comment reminded me ... my VW mechanic friend claims they use
Bosch filters that have a relief valve where other filters do not. Claims
it can save an engine and that is why VW puts them in their cars.
Then there's the aftermarket oil filters that use a roll of toilet paper.
Wes
on 9/13/02 12:28 PM, ardunbill@webtv.net at ardunbill@webtv.net wrote:
> Hi Folks, I felt like stirring up some hate and discontent the other
> day, so it occurred to me that I should take a hack saw and carefully
> open up the Motorcraft filter I had dutifully replaced on my '95 Lincoln
> Mark VIII. My purpose being to see just what contaminants I had caught
> after 5000 or so miles, and why I was changing it. You know that, since
> the mid-'50s, we have all taken great pride in constantly changing the
> full-flow filters on our daily drivers. As an aside, you might care to
> know that on my beloved Vincent motorcycles, the designers incorporated
> a full-flow felt filter into the pressure side of the oil pump starting
> with the 1946 model. But that was in the non-detergent oil days.
>
> Back to the Motorcraft filter. As I suspected, there was literally
> nothing to be seen in the way of crud, metal particles, or anything
> else. The paper accordian in there just showed that slightly dirty oil
> had been flowing through it.
>
> So I want to ask the experts, why am I instructed by Ford Motor Company,
> very sternly, to change this filter every six months when I change the
> oil?? I fully agree that it is a good thing to dump the oil at that
> interval, but I have to think the filter could function perfectly well
> for four or five times this amount of service, with no harm to anything.
> Another point is that it is just barely possible to get the filter out
> and back in, so tightly is everything packaged down at the left front of
> the engine.
>
> I well understand that little particles of metal do come off various
> places, such as in this engine, the cam chains and sprockets. Not to
> mention bearing surfaces, pistons and rings, cams and cam followers,
> etc. I do believe, however, that most of it gets stuck in the "gravy"
> that inevitably forms on the bottom of the oil pan. And much of the
> rest can't make it through the screen protecting the oil pump intake.
>
> So someone tell me. Are the particles the filter is catching so
> microscopic that my eyes can't see them through my 2x shop glasses? Are
> the microscopic pores of the filter getting clogged up so that it will
> start by-passing the oil??
>
> What's the logic here? Inquiring minds want to know. Ardun Bill
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