Thread: 1st Time Pontiac Owner, How to Improve MPG???

Originally Posted by Suspect

so another question then, does anyone advise against running a full synthetic oil? I was thinking of switching to Mobil 1 extended performance oil/filter and going 10k between changes, since I do all highway with this car. Do you guys run full syn? blend? is there a forum favorite oil?

I don't trust a filter to last that long, and 10k on oil is long time. Even though they say it's do-able. I know of too many car engines that just bake the oil like no other in under 3,000 miles, crazy how fast some motors either eat it or abuse it. I see it more on chrysler motors, 3k and it's black as night.

You can run whatever oil you wish, the standard 3k for regular oil can be pushed back to 4000ish just because when it's all highway the oil is always up to temp and takes longer to break down. The color in the oil will still be there and won't be black yet. If you did full syn then maybe 6k is alright, most filters are 5k miles for like a napa gold.

Originally Posted by Fivefingerdeathpunch

I don't trust a filter to last that long, and 10k on oil is long time. Even though they say it's do-able. I know of too many car engines that just bake the oil like no other in under 3,000 miles, crazy how fast some motors either eat it or abuse it. I see it more on chrysler motors, 3k and it's black as night.

You can run whatever oil you wish, the standard 3k for regular oil can be pushed back to 4000ish just because when it's all highway the oil is always up to temp and takes longer to break down. The color in the oil will still be there and won't be black yet. If you did full syn then maybe 6k is alright, most filters are 5k miles for like a napa gold.

Okay cool thanks. I've been running mobil 1 in my st but it's direct injected and turbo so I feel like it's worth the extra expense. With the GP being n/a and not di I am thinking maybe a less expensive full syn like shell and a good filter and going 5 - 6k between changes.