First long trip with synthetic oil (mobile 1)
 

Took my first long trip down to south jersey and NYC with mobile 1. Going down on sunday, I went 399 miles on 12.65 gallons (31.54 MPG), going 80+ mph with the AC on the whole time. That is above what I got ith the petro oil. especially going that fast. A little traffic and some city driving included in this, too.

Coming back I went 365 miles on 13 gallons (28.07 MPH), but drove much more aggressive. Had the AC on the whole trip, too. More traffic coming back and I was driving much faster then on the way down. There were times on the Garden State Turnpike that I was averaging 85+ for long periods (4000 + RPM's).

Very happy with milage after changing to synthetic.

-R

what was you mileage before you changed over?

I would get close to 30 going w/o AC maybe a little more or less. Also depending on the speed you are driving affets milage. I got close to 35 MPG last june driving up to bar harbor, with 50 % driving on rt 1 (45-55 MPH).

I seem to be getting my average weekly driving around 25 MPG with the synthetic when I used to get around 22-23 MPG in the petro.

I have noticed that the engine temp guage runs 5 degrees cooler than it did with the petro oil........

I am very happy with the change to symthetic and believe it is better for the engine in the long run although so is prtro-oil if changed according to cars specs.

Synthetic oil does not break down as fast and has been proven to decrease friction between the metal parts in your engine.

-R

How many miles on the car before you made the switch over? I've heard that there is a recommended milage period before switching over to synthetic, to allow for a complete break-in of the motor. Once upon a time I thought it was about 10K miles.

I switched over at 6K miles, and also changed my tranny fluid to synthetic as well. Average 36.5 on a round trip from Phoenix to Santa Barbara with the A/C off and averaging 80mph.

Did mine around 10,500 K. Heard to let the engine break in, but I have heard that others do it on the first oil change around 3k. I don't really think it matters, you should not keep changing between the two though. Once you go synthetic, you should not go back........

-R