2015 RT 5.7 M6
Today I just discovered that my 2013 5.7 GC has massive sludge build up in the radiator. I found this out accidentally when I filled the coolant reservoir with windshield wiper fluid. (My liberty and challenger has the fill on the LHS but the GC has it on the RHS). It wasn't until I was about to close the hood that I realized my mistake. So I siphoned the reservoir tank and was about to pull it from the car when I noticed that there was sludge build-up in the radiator. I stuck my finger in and pulled out a heap of sludge. Bought the GC brand new on 1/1/2013 and never added coolant to the system...so I was like WTF?! Then I remembered the water pump was replaced by the dealership because it was faulty. I guess they must have mixed the HOAT and OAT coolants and after a couple of years driving I final stumbled on the problem. Looks like I will be spending tomorrow flushing the coolant system. Just giving all you guys a heads-up on making sure you KNOW what coolant your car is running and don't mix.