My 2007 Pontiac Grand Prix V6 has about 106,000 miles and uses approximately a quart of oil every 3,000 miles. We do regular maintenance on the vehicle (before the oil life monitor alerts us to) and have started using synthetic oil.

Is this a normal amount of oil usage for the age/miles? The car has mostly highway miles.

Thanks

a quart is normal, ive had a bunch of gm'* and put a bunch of miles on each and they all go through a quart every oil change. i normally do mine at 5k. never noticed any difference in synthetic or high mileage so i just use valvoline or normal nextgen

We have always used Valvoline and have recently changed to high mileage synthetic Valvoline...
so its not going to hurt to add the quart and keep driving another couple thousand miles before changing the oil?

no it wont hurt anything. i tried the valvoline high mileage stuff in my bonnie with the same engine, it lost a couple miles per gallon and ran like it had winter gas in it. put the regular back in and its back to normal, same with the old 03 monte i had. i bought them both almost new and always kept mileage records. the old monte had 180k before i traded it in the bonny has almost 190k, i had a 3100 gp that had 300k, a few others i cant remember. they all had normal valvoline every 5k and got the same or better mileage as new

I'm with Justin.

Thanks for all your help.