Update-Very long story, I will try and make short here. Back in January 2021, I filled complaint against local dealer(Alfred Matthews, Modesto, Ca), they were horrific. I got a case number from GMC. My 2020 GMC AT4 3.0 had been in the shop over 20 days. I was disgusted with dealer and problems...
6-21-21, I spoke with GMC dealer service manager. Smaller dealership in Central Valley, Ca. Manager said they have seen 2 more, GMC 1500 3,0L diesels with blown rear seal and oil everywhere. Mine is currently at 14,000 miles. It seems, since the oil leak at 7k miles, gas mileage not as good...
I am not sure, if lower timing cover seal and rear main seal are the same. I think, I remember GMC dealer mentioning timing cover was part of the process. I am lost, after 1975 small block motor technology.
My rear main seal, went out at aprox 7000 miles. GMC dealer said the main seal was installed incorrectly at factory. Truck was down 6-7 days. I got the GMC back and still had small leak. Back to GMC dealer and another 6-7 days. GMC dealer said, their tech did not install, the new rear main...
Hello, I have a 2020 GMC 3.0L with aprox 7k miles. While I drove home, kept smelling oil burning. Arrived home and backed into the shop, noticed oil EVERYWHERE on the ground. No engine check lights came on. Towed to dealership. 2-3 quarts low on oil. Transmission had to be removed...