Oil filter

[albertramsbottom]

This is related to my other woes but I was wondering if an old oil filter could get blocked and reduce the flow of oil?

Cheers

[Red Westie]

Yes and no...lol.
By-pass types fitted to earlier air cooled engines only filter a proportion of the oil coming from the oil pump. When an filter blocks none of the oil is filtered (not good)
Full flow types (later water cooled and diesel engines plus nearly all modern vehicle engines) have a bypass valve built in to each replaceable canister filter, if the filter paper blocks, oil pressure will build up inside the oil filter and when the pressure difference across the filter reaches approx 1bar the by-pass valve opens allowing oil to 'BY PASS' the oil filter (also not good)
Both the above senario's are avoided by adhereing to VW service intervals.