switching back to natural oil?

[fnkngrv]

Originally Posted by bronsin

If you are thinking you will get better gas mileage using synth think again. I drove 5200 miles to AK from NJ on regular motor oil and returned the same way using synthetic. There was no difference in gas mileage over 5200 miles.

As racerb stated you should do an engine flush between the two types of oils to ensure that you have removed all of the contaminants. You should have seen the amount of garbage that came out with the flush of the motor that I just put into my car and that engine had only 23k on it with conventional oil. I totally believe that you didn't notice an improvement in FE on your trip. There is a reason why AMSOIL for example makes the claim that over time you should notice an improvement and not over the short haul.