I seem to be having a problem with overheating in my 92 Z28. It has a tendency in stop and go traffic to easily break the 220 mark. the fans work and the water pump pumps but it still stays way up in temperature. I noticed that when at idle after the engine gets warm from about 10 minutes of driving the oil pressure goes to 0. Ive changed the oil and used a thicker oil. But, here is the kicker if i sit in the traffic and rev the engine a bit to build up oil pressure the engine temperature goes down. What could make the oil pressure go down after it gets warm?
Any help would be greatly appreciated!

 

could be the oil pump is just getting weak, is it the stock pump? are you running multi weight oil?

 

You might want to change your oil pressure sensor, I have seen them start to go bad by loosing sensitivity to low pressure.

 

Hot oil is thinner than cold. It squirts out of your worn bearings more easily than when cold, dropping the pressure.

Revving the engine up a little in traffic speeds up the water pump, and cools better.

 

If it is reading 0 psi yet still running just fine, check the oil pressure sensor. Sounds like yours went out.

Warmer oil is thinner than cold oil & produses a lower oil pressure, but not down to zero.

 

Ok I understand this part now. What are my choices to fix this without rebuilding the entire engine? I already have 10w40 in it now

 

Replace the oil pressure sender, it's down right above the oil filter sticking straight out sideways, probably, but check the pressure with a manual pressure tester first to verify that that is the problem

 

Would I need to remove the filter to do this? Seeing as I just changed the oil yesterday in the hopes that that would cure the problem

 

No

 

almost have the same problem. but mine always reads 60? it runs at 220 all the time! but if i turn on the a/c it shoots up to 260 fast!! i cant figure out if that has anything to do with it or not but im worried it way to hot?

 

When they qualify at daytona and talladega they use much lighter weight oil and it gives them about 15 horsepower. Heat also thins oil but a certain amount of heat makes oil work better up to a point. Try a taurus fan and it will cool your car. I just got rid of my dual fans and went the taurus route and it is enormously superior.