i just bought a 98 z28 with 35k miles. as i already posted, my oil pressure seems a tad low. but tonight i noticed some other things, so im going to start another thread. first of all, it takes my car like 35-40 minutes to reach operating temperature. hell, it takes like 10 minutes for it even to get to the first line, which is 160 degrees. my other ls1 cars never took anywhere near this long to warm up. oh, and the temperature guage needle even went over 210 tonight to around 215, then climbed back down to 200...and this is while sitting at idle in a parking lot.as far as the oil pressure, at cold idle, it sits at around 40 psi. as the engine temperature comes up, the oil pressure goes down like normal. but tonight, it went down to 10-15 psi at idle. oil pressure is climbing like normal when accelerating, but at idle it got all the way down to 10-15 psi tonight once the engine reached the 210 mark. and i noticed that both needles are fluctuating, not just the temp guage needle. so basically, my engine is taking 40 minutes to reach operating temperature....and even when it does, it fluctuates up and down. and my oil pressure is very very low, and also fluctuates. it seems that when one needle fluctuates, the other one does too....almost like one is triggering another. can someone please chime in and help me figure this out. i have a 90 day 3k mile warranty that covers engine, drivetrain, and all electrical problems. i called and set an appointment to bring it in on friday morning. im still worried though. lil help fellas???

 

I would have them check out the oil pressure sending unit for sure. If that is in tact, there is a greater problem here. 98's are notorious for having bad oiling systems, specifically failing oiling pumps. With only 35k on the car it typically wouldn't have presented itself as a problem just yet, but who knows for sure.

As for the temp, faulty thermostat maybe?

I would certainly have the car looked at and get this sorted out.