dieseldave11
Well-known member
my fuel economy has decreased alot since I bought my car (02 jetta tdi) I was getting about 45 mpg now I am getting about 40 max but mostly 36, I need an oil type to put in my car that will get me great mileage, I looked at the t6 rotella today but it didnt say it was CF-4 certified on the 5w40, I also look at mobil 1 10w40 high mileage oil would either of these work or increase fuel economy? what type of oil filter does an 02 jetta use? and are there any fuel additives that I can add to my diesel tank to increase mpg? thanks alot!