Originally Posted by XC_Rider
Look it up in the owners manual and follow the recommendations.
He's an 03... if he goes by his manual he's going to go 5000 miles too far or a year too long on Mobil 1..... The Oils rating was changed in 06 to 10K/1year. Spec 0W40 is easy enough to find... Mobil 1, Castrol Syntec, Gulf GTX and several other brands.