so i did an oil change from previously valvoline maxlife 10W30 with a FRAM oil filter and went to mobil 1 supersyn (full synthetic) 10W30 with a mobil 1 oil filter, and my mileage has gone way down! I thought it would go up with the change to synthetic....read about someone else who had the same issue, but I can't find the thread to find out what people were saying about it and what happened in the end....

does anyone have the link to the thread that talks about this exact issue with lower mileage going to mobil 1?

why would something like this happen? it is a considerable loss in mileage as well...should i just wait about a 1000 miles or should i just change it back to valvoline or some other oil? should i stay with synthetic at all?

 

it is a good idea to flush/clean your engine prior to switching to synthetic. amsoil makes a good one. if you dont flush it the new synthetic will loosen up lots of stuff in there and create more friction on the engine. If I were you I would change it again after 2-3k miles.

 

http://forums.maxima.org/showthread.php?t=227996

as our moderator bill suggested, FRAM product sucks. you should change to nissan OEM oil filter. FRAM does not filter as good as nissan OEM filter.

my personal experience with mobil 1 supersyn synthetic oil + nisan OEM filter gave me better gas milage, i felt a bit more power, and the engine shifts smoother. you can change out my homepage, page 6. it has my basic maintance information on it. good luck man

p.s. gives the max sometime to adjust to the new synthetic. if you still get bad gas milage by then, come back and keep us posted.