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Originally Posted by JCL
A filter works until it is clogged, when it goes into bypass mode. It gains some filtering efficiency as it is used. If it falls apart from age, it stops working completely. I am suggesting that that disintegration point is somewhere north of 15,000 miles, or two years, using an OEM filter.
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The bypassing of an oil filter is the lesser of two evils. You're recirculating dirty oil instead of suffering oil starvation. This can happen at anytime during the life of the oil filter and I'm not aware of any warning indicators for this scenario.
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Originally Posted by JCL
We are all entitled to our opinions. If you think that the filter will only last 20% of the published life, with no safety margin, then great  (This was where I suggested an environmental tax for excessive contributors in an earlier post) |
Is that 20% of the published oil change interval or oil filter life? Does the BMW service docs speak specifically to oil filters?
Environmental tax is whole different discussion that I'm not getting into.
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Originally Posted by JCL
You are referring to the oil change now, not a filter change limit. A very different oil, a different engine with many times the contaminants from combustion, and therefore a much shorter oil life. Standard practice to change the filter with the oil. If we moved from a filter change limit to a discussion of oil change intervals, we could go on for many more pages  |
It was a simple question. I'm not aware of any oil filter change interval that is different from the oil change interval. So I'll restate my question, does anyone know what the oil/filter change interval was for the E34 535 which uses the same oil filter as on one of my cars that has a suggested oil/filter change interval of 15k miles?
I still have yet to see exactly what has been done to the oil filter that increases service life.