rbattelle
TDR MEMBER
My truck is 6 days away from it's 1st birthday. When I bought it, I planned to change out the factory HOAT coolant for good 'ol ethylene glycol. This morning I took the truck to Cummins to have this service done. I wanted to put out here what happened, and get any opinions you may have.
First, I asked for Fleetguard premix ES Compleat ethylene glycol (P/N CC2825). Instead, they put in ES Compleat propylene glycol (P/N CC2835). This worried me, so I asked them about it. They told me that they don't stock any ethylene glycol coolant, and every single truck that comes in gets propylene glycol (including the B series engines). Only if a customer insists on something else (like HOAT or EG) will they make a special order for the stuff. They said Cummins specifically recommends PG for all their engines, claiming that it gives the best performance. It specifically states in my owner's manual, however, that PG is not recommended. The Cummins shop was absolutely perplexed as to why PG was not recommended. 2 different people told me that the last time they were at a Fleetguard class someone asked about mixing HOAT and PG/EG, and they were told there is no problem doing so (except that the color of the coolant will be ugly). I also have an email from Fleetguard stating that they are not aware of any issues mixing their coolant with those from other manufacturers. The bottle of PG states specifically that it is compatible with every other antifreeze on the market, and offers the same performance as EG.
Secondly, they did not actually "flush" my cooling system, as they don't have a coolant flush machine. They drained the radiator, filled with water, drove the truck around the block, then re-drained the radiator and refilled using the aforementioned PG. The tech was able to get about 21 quarts of new coolant in there (recall system capacity is 27 quarts). When I left, I checked under the hood first, and found the overflow reservoir had 1/3 blue PG in it, and 2/3 orange HOAT. I went back and complained, and they drained the overflow for me and refilled with PG. That brought the total new coolant up to about 24 quarts. This implies there are 3 quarts of HOAT still in the block. The tech explained that there was no block drain on the engine, so he was not able to drain the block.
Cummins was not concerned with mixing the HOAT and PG, and assurred me there would be no gelling or anything.
What did all this cost me, you ask? $356. 86.
I know this is long... thanks for reading.
First, I asked for Fleetguard premix ES Compleat ethylene glycol (P/N CC2825). Instead, they put in ES Compleat propylene glycol (P/N CC2835). This worried me, so I asked them about it. They told me that they don't stock any ethylene glycol coolant, and every single truck that comes in gets propylene glycol (including the B series engines). Only if a customer insists on something else (like HOAT or EG) will they make a special order for the stuff. They said Cummins specifically recommends PG for all their engines, claiming that it gives the best performance. It specifically states in my owner's manual, however, that PG is not recommended. The Cummins shop was absolutely perplexed as to why PG was not recommended. 2 different people told me that the last time they were at a Fleetguard class someone asked about mixing HOAT and PG/EG, and they were told there is no problem doing so (except that the color of the coolant will be ugly). I also have an email from Fleetguard stating that they are not aware of any issues mixing their coolant with those from other manufacturers. The bottle of PG states specifically that it is compatible with every other antifreeze on the market, and offers the same performance as EG.
Secondly, they did not actually "flush" my cooling system, as they don't have a coolant flush machine. They drained the radiator, filled with water, drove the truck around the block, then re-drained the radiator and refilled using the aforementioned PG. The tech was able to get about 21 quarts of new coolant in there (recall system capacity is 27 quarts). When I left, I checked under the hood first, and found the overflow reservoir had 1/3 blue PG in it, and 2/3 orange HOAT. I went back and complained, and they drained the overflow for me and refilled with PG. That brought the total new coolant up to about 24 quarts. This implies there are 3 quarts of HOAT still in the block. The tech explained that there was no block drain on the engine, so he was not able to drain the block.
Cummins was not concerned with mixing the HOAT and PG, and assurred me there would be no gelling or anything.
What did all this cost me, you ask? $356. 86.

I know this is long... thanks for reading.
