A lot of people think OEM filters are just rebadged, but I can assure you that they are not. When a manufacturer wants a filter for a new engine series, they ask a filter company to design one specifically for that engine and service interval, they then sign an exclusive contract that does not allow the filter company to sell the same filter under another label. This means it is not possible to buy the exact filter from anyone other than the car manufacturer.
If an engine has been in production for some time, other good filter companies will design or modify a filter for the engine concerned, so what that means is that if you have a very common type of engine in your car that has been in production for some years, good non OEM filters are available and safe to use, BUT never use non OEM filters for new or less common engine types, because you run the risk the filter you are using was not designed for the engine, but just modified from another type and it may not perform as well as a real OEM filter.
Another point I noticed is that a lot of folks believe the advertising from the filter companies and fail to comprehend that the efficiency figures quoted are for a dirty filter, not a clean one and in reality it is very difficult to get information on the true performance of a new type of filter.
Originally Posted By: bigjl
I stick with OE filters usually, but I am happy to use a quality filter like Bosch or Hengst, even Mann as they are also good.
In Europe filters are normally made by other companies and rebadged for main dealer sale, companies like EuroCarParts and German&Swedish buy these OE spec filters from the OE manufacturer and sell them on at lower prices, Halfords and similar shops sell own brand filters but I wouldn't touch them as nobody really knows who makes them.
Filter choice is not as wide in the UK.