2020 GMC AT4 3.0L/Massive Oil Leak

gman

New member
1
0
Year
2020
just to add to the list, i have a 2020 gmc siera denali duramax and the rear main seal blew. 6800mi
 

MNTIM

New member
24
4
Have a 2020 1500 Diesel with 11k miles. Rear seal blew while on a road trip 250 miles from home, engine light came on steady, reduced engine capacity, trans fluid up to 195 degrees, oil down to 18%, leaked all over, undercarriage/running boards all splattered. Towed to dealer, should have it repaired in 4 days they needed to have the part FedEx'ed. Apparently they are going to have it delivered to me back home. We will see. Hope that is the last of the problems.
On the bright side. The fix they have is a sure fix now so you shouldn’t have any issues. But I sure would press for extended warranty or somthing
 
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