Originally Posted By: refuse2
I use there 137and and 137ulsw every day and haven't had and trouble with the fuel system even when every one else around was gelling and such.
x2... I switched from Stanadyne to Schaeffer's 137 Summer and Winter additives and have not suffered any reduction in performance or mileage. I still get 21.5 on the Interstate with my '07 Dmax even while running Moly-Bond X200 15w40... FYI, the I84 speed limit is 75 mph...