Turbo experts claim that the turbo itself requires the synthetic oil because of the high heat generated especially after shut down when the oil is no longer circulating & the turbo is still HOT. I use Mobil 1 (5w30 winter, 15w50 summer) and after 3k miles, it's dirty. It may still lubricate ok, but I think clean oil is better for the motor than dirty oil so I change at 3000 miles. Haven't had to file for bankrupcy yet...& I don't even shop at Wallmart.
|