2024 GMC Sierra 1500 Elevation 2.7L Turbomax Oil Leak at 2000 Miles

[Tuishimi]

Ugh!  What a horror story.  I have to say I tend to avoid the dealership for anything but warranty work.  Don't hate the truck because of the dealership.  Although having a bad main seal on a pretty new truck like that must be super frustrating.  I guess I will keep an eye out on mine as well!

[Bruce Diamond]

I have a 2025 Sierra with the 2.7 turbo max. Took it in for state inspection at 2800 miles and was told there was an oil leak. Made an appointment for diagnosis and was told it was either the rear main seal or upper oil pan. I left the truck and was given a loaner. Week and a half later they replaced the engine rest main seal housing and I was told it was fixed. Two weeks later it’s still leaking. Going back to leave the truck until it’s fixed. I’m very disappointed and concerned to read of others having the same issue. If it continues I’m going to push for my money back or a new truck with the 5.3 V8.

[GMCustomerService]

On 5/12/2025 at 11:15 AM, Bruce Diamond said:

I have a 2025 Sierra with the 2.7 turbo max. Took it in for state inspection at 2800 miles and was told there was an oil leak. Made an appointment for diagnosis and was told it was either the rear main seal or upper oil pan. I left the truck and was given a loaner. Week and a half later they replaced the engine rest main seal housing and I was told it was fixed. Two weeks later it’s still leaking. Going back to leave the truck until it’s fixed. I’m very disappointed and concerned to read of others having the same issue. If it continues I’m going to push for my money back or a new truck with the 5.3 V8.

Your disappointment is understood, Bruce. Our team would like to get involved with your dealership to determine the next steps, and we ask that you reach out to our team at [email protected] with your full VIN, dealerships name and address, your phone number, and your Sierra's mileage. We look forward to your email and to learning more. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

[Canyonero]

This happened to me as well, at around 1,150 miles into my 24' GMC Canyon. After one and a half month, I was told my truck was ready for pickup. I drove from dealership to my home (~15 miles) and the oil pressure gauge went nuts. This is very frustrating, I bought what I thought was a reliable truck and now I can tell my truck has been more time in the shop than in my possession. I've been going back and forth with my Case Manager only to know that my buyback offer is below of what I have invested in the truck. It seems like consumers need to pay for GM Factory mistakes.

[Bruce Diamond]

My 2025 Sierra is in for the second time for an oil leak on the 2.7 TurboTax. First was at 3000 miles although I think it was leaking when new. They replaced the rear main seal. Days later I had the same leak. Back to the dealer and they diagnosed a faulty rear main seal. I have been truck less thirty days between visits and the dealer can’t get the needed parts. I’ve already filed a case with GM for them to buy it back. Beyond disappointed and frustrated. Today is the 5th and the part eta is 6-16th.

[64BAwagon]

Document everything in writing, nothing verbal between you and the dealer. They hate paper trails.