91extcab
+1y
Guys in the xb's claim to see a worth it effect when they change to synthetic in their transmissions... An increase in mpg effect. They also use or do a change over to synthetic for the motor oil as well, once again they are seeing improved mpgs... quite a few have gone from the epa estimated mpg of 28city/33highway to 40+ mpg average to one guy getting 54.9mpg. Granted some of this comes from changing ones driving habits/style, but guys who regularly drive the same everywhere who then changed from reg fluids to synthetic were able to report increased mpg after the change.
Plus synthetic might be more expensive, but 10k-15k between oil changes would be cool with me...
On a liability note: switching from reg oil to synthetic can pose a problem.... Oil passages becoming clogged. The advise I've read is to do the change over in parts. Run part reg oil, part synthetic, change at normal 3k interval or sooner. Change oil again, this time more synthetic than reg oil. Another short interval, but longer than the first time between changes. Final time full synthetic with a new filter (new filter every time because as you run the synthetic, the synthetic cleans every where in the motor out touches, i.e. cleans off sludge and carbon from inside the motor) and run it but check levels regularly, and if you are low and only top off with synthetic you should be easily able to go 10-15k between oil changes. And you wont have to flush the oil system again. Once again this is just information I've read, but do have full intentions tio one day try the information for myself. Especially if I ever rebuild my motor...