The Audi A4 (along with most german cars) is a persnickety beast. It can be difficult to find the parts and liquids that older audi's require, but amazon has done an amazing job stepping into the auto parts and supplies arena. For the past 4 years I have been running my 1.8T engine car with the Mobil 1 M1-301 Extended Performance Oil Filter, but recently I have made the swap to this Mann-Filter W 940/25 Spin-on Oil Filter. Not only is it less expensive, but Mann along with Mahle and Bosch are OEM suppliers to Audi and provide a superior internal filter structure and material. This is one of those items that you just should not skimp on, it is not worth a potential sludge problem.
Besides the build quality, Mann filters also feature an interface on the top to allow easy removal without the use of specific oil filter tools.
When installing, be sure to only tighten by hand, using one of the lasoo type tools can easily damage the case and internal filter.
For those looking for more information the Mann catalog entry can be found at: http://catalog.mann-filter.com/EU/eng/catalog/MANN-FILTER%20Katalog%20Europa/Oil%20Filter/W%20940~25
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