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Re: Oil pressure issue...Sludge, sensor or other?
I suggest putting exactly what VW says. Syntetic is a little expensive, but the oil changes are farther out too i.e. 5k-7k. Also, 5w40 is thicker than 5w30 or 5w20.
Also, check if t-belt was changed, pricy job (one hint, is that it might say on the belt itself).
Good luck,
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