At 5000 miles I changed my oil to Mobil 1 0-40W also with a new VW filter on my '03 Passat Varient with a 1.8T. I've noticed a 1 second tappet sound much like an oil starved hydraulic lifter (does this engine even have lifters?) when first starting in cold weather (I'm in central Virginia). This didn't happen with the original dealer oil in. Anyone else have this occur with Mobil 1 0-40W? Am wondering if I should pull out a few quarts and put in some Mobil 1 10-40W to raise the viscosity?
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