I use Mobil 1 synthetic, 15/50. the Mobil 1 website has the following recommendations:
Mobil 1 with SuperSyn� is available in five viscosity grades:
Mobil 1 with SuperSyn� 10W-30 � Higher-Mileage Vehicle Formula
Mobil 1 with SuperSyn� 5W-30 � Newer Vehicle Formula
Mobil 1 with SuperSyn� 15W-50 � Performance Driving Formula
Mobil 1 with SuperSyn� 0W-30 � Enhanced Fuel Economy Formula
Mobil 1 with SuperSyn� 0W-40 � European Car Formula
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