Hi folks:
I picked up a work beater, its a 1995 Grand Am with the 3100 v6. Car has 120k miles on it, and I live in the Seattle Area, so it rarely gets below freezing here.
I put Mobil 1 5W30 in it, and my commute is about 26 miles (all highway) each way.
Oil has about 2 months/1000 miles on it.
Lately, I've noticed the factory oil pressue guage will drop from 40 psi to maybe 25 psi after the engine has been running for 1/2 hour or more. This is more of an "all at once" drop, rather than a gradual degradation. I suspect one of the contributing factors is that the system only holds 4 1/2 quarts including the filter.
I plan to dump the 5W30 and put in Mobil1 0W40, and see if the oil pressue is better on long drives.
I'm assuming you folks who know a whole lot more about oil than I do can guess why the strange drop.
Any suggestions?
Regards,
Ron
I picked up a work beater, its a 1995 Grand Am with the 3100 v6. Car has 120k miles on it, and I live in the Seattle Area, so it rarely gets below freezing here.
I put Mobil 1 5W30 in it, and my commute is about 26 miles (all highway) each way.
Oil has about 2 months/1000 miles on it.
Lately, I've noticed the factory oil pressue guage will drop from 40 psi to maybe 25 psi after the engine has been running for 1/2 hour or more. This is more of an "all at once" drop, rather than a gradual degradation. I suspect one of the contributing factors is that the system only holds 4 1/2 quarts including the filter.
I plan to dump the 5W30 and put in Mobil1 0W40, and see if the oil pressue is better on long drives.
I'm assuming you folks who know a whole lot more about oil than I do can guess why the strange drop.
Any suggestions?
Regards,
Ron