BMW dealer uses 5W 30 synthetic in my car. Weight of oil should not be the issue with your oil pressure. BMWnyc325 guy sounds like he knows what's up. Follow his advice. Good luck!
98 328i, black/black, manual, canadian sport pkg, ECIS intake, koni sport adj's, dinan springs, oe/oem clears.
Considering: tms shark,M 17" wheels, larger sway bars.