MEK000020 for Mk2 Fs and all TFs, which have MEMS3 ECUs. The other thing to note is that the threaded hole size in the oil filter adapter changed when the oil filter adapter changed at engine 18K4FJ31 646501 or 18K4FJ32 646201 according to the info on Dieter's website.

But as Cobber says, knowing the oil temperature is the next best thing to useless information.

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