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In the cold weather in Jan 2011 I noticed an oil leak which was worse than usual and tracked it down to the oil filter which had come quite loose and was dripping a drop of oil every 5 yards or so - not far off coming off completely, with the predictable unwelcome consequences. I have since kept an eye open for this problem, and it has not recurred, but we had little cold weather last winter. This evening my better half mentioned a patch of black snow where the Landy had been, and sure enough the oil filter had loosened about 10th turn. I have always used LR or good aftermarket filters, smeared the rubber washer with oil before fitting and done them up by hand as tight as I could from underneath (getting a strap wrench in on a Def 90 300TDI is a pain). And two filters a year in normal weather - no problem. However, very cold UK weather (down to -10degC) and then a warm engine does seem to cause them to come loose. On the race cars, we lockwire oil filters on because of the vibration, but that is not so easy on a 300TDi. Has anyone seen this before or is it just me ? If so is there a simple solution this side of lockwire, or crawling underneath in the snow and checking ? Apologies if this has been covered elsewhere. Regards Richard