Originally Posted by spot_skater

A good rule of thumb for oil pressure is 10 lbs for every 1000 RPM...

At idle, 10 psi is good. @ 2k, 20 psi, 3k 30 psi, etc. etc.

Originally Posted by sar

I think the big problem is that you're accelerating hard before the oil is warm.

Oil should have higher cold pressure and then drop to a lower pressure when warm.

Nothing wrong with using 10w30 (esp in winter) unless your oil seals are infact bad, but that is not necessarily your problem.

Let the engine fully warm and not letting off hard at high rpms reduces smoke.

If your oil is consistantly at 15psi I would suggest first changing it, even trying a heavier oil, but if your car has a lot of miles on it the oil pump can be wearing down, so be wary of that too.