Oil Filter
09-10-2003, 11:02 AM
#6
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Warning: Make sure it has a backflow valve
Audi's require the oil filter has a backflow valve. Filters made by Mann have them. Frams do not. Sadly I cannot remember the technical reason for this but if you search the Q list archives it is there.
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09-10-2003, 01:33 PM
#8
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Be aware that Audi runs a high-pressure oil pump requiring a filter designed for such.
I'd stick with OEM unless I specifically knew an alternative would work. However, you need not purchase the filters (Mann brand) from an Audi dealer. There are many aftermarket sources.
09-10-2003, 01:44 PM
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Anti-backflow valves are so that oil does not flow out of the filter after the car is shut off
Bypass valves allow oil to pass around the filter should it become clogged or otherwise unable to handle the oil pressure through the filter element. Fram, and other makes have both a bypass valve and an antibackflow valve. But there is some question as to the quality & performance of the Fram setup.
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