ChiTDI
Veteran Member
I think the turbo and the EGR benefit from the synthetic (5w40 vs 15w40) , others may chime in on this.I just changed my oil with T6, but without looking until after I was done, I noticed it was 15w40. Has any one used a higher viscosity oil for an extended time? With a mpg penalty due to the thicker oil, are there any other issues to be concerned with? I've never had any other car that I was this paranoid about oil.