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Originally Posted by Brucelee
Factory fill is Mobil 1 0W-40 and that is what most dealers will use when servicing car. Good stuff.
Mobil 1 15W-50 is also great for summer driving where you are but it will hurt your MPG just a tad.
Also, Shell Rotella Fully Synthetic 5W-40 is superb also and much cheaper than M1. Wally World sells this for under $3.50 per quart.
Good luck!
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Shell Rotella T Full Synth, this is what i use for my MB Diesel....is it really compatible with Porsche Engines??