I was just curious about the oil pressure in the 2004 Z. Mine runs about 80 to 90 when first cranked up. It then drops to around 60 lbs at speed, where it stays most of the time, unless under acceleration or at idle. At idle, mine goes to around 20 to 30 lbs. Since I am new to the "Z", this has me sort of concerned, as my other vehicle prior to this alway had higher oil pressures by gauge. The dealer service manager says that this is the way Z motors run. I dont feel too confident in his word after my last service where they left the cap off the radiator overflow tank....is this right or not?