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Jerry, Master Mechanic
Category: GM
Satisfied Customers: 17219
Experience:  ASE Master tech, 30 years experience GM certified
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2002 gmc 2500hd 6.0, changed leaking oil pressure sending

Customer Question

2002 gmc 2500hd 6.0, changed leaking oil pressure sending unit. oil pressure starts out at 25 and increases to 35 at hwy speed. However, the more I drive it gets lower and lower but never less than 20. do I have a problem?
JA: Have you ever replaced the gaskets? Maybe the hoses?
Customer: which ones
JA: What is the model of your '02 GMC?
Customer: 2500hd
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: no, my regular mechanic is. He just changed knock sensors, op sending unit and cam sensor
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 11 months ago.
Category: GM
Expert:  Jerry replied 11 months ago.

Hello and welcome. My name is ***** ***** you for visiting the site, I am reviewing your question and will reply shortly, thanks.

Expert:  Jerry replied 11 months ago.

Let me just say that any money that you paid, or if you have a subscription, that money stays in your account until the answers are rated, (positive) regardless of how fast or how long it may take to get finished. You can FOLLOW UP AT ANYTIME, even after rating.

No problems, that is perfectly normal for the oil pressure. The reason it get slightly lower as you drive is because as it warms up it lowers the pressure because the oil becomes slightly thinner. Here are the factory specs on it, thanks


41 kPa at 1,000 engine RPM (6 psi at 1,000 engine RPM)
124 kPa at 2,000 engine RPM (18 psi at 2,000 engine RPM)
165 kPa at 4,000 engine RPM (24 psi at 4,000 engine RPM)

Please don’t forget to rate the answer in a positive way, . EVEN IF YOU HAVE A SUBSCRIPTION ****THAT IS THE ONLY WAY I GET PAID ****

Expert:  Jerry replied 11 months ago.

Did you get that?