Small leak somewhere perhaps a pin hole in a line, Leak around the Thermostat, get it pressure tested. Could be an issue with the Head.

 

White smoke from the exhaust and/or tips are white inside?

 

I'm beginning to suspect a head gasket issue - coolant is going somewhere and the loss of power (coolant in combustion chamber will affect power ouput)

as @72/340 mentions, if there's white smoke from exhaust = coolant leak

 

Check your oil too. My truck was drinking fluid rather than burning. Really pissed off the Chevy dealer when they found out it was still under warranty.

 

As others have said, the most likely culprit is a head gasket leak either dumping into the cylinders or the crankcase. 3 gallons in 3 days is a lot though.

 

all signs point to failed head gasket.
check for "milky" oil.
white smoke out the exhaust.
bubbles in the coolant - post thermostat opening.
you really dont want to keep driving it, the coolant will 'wash' the cylinder walls of needed oil, among other bad things. high chance as well of overheating the motor, which leads to cycinder head rebuilds,etc.

 

Stop driving it if at all possible - check your coolant overflow - is there ANY slimy stuff adhering to the container? Check your oil, is there any discoloration of the golden fluid, or carcoal black (as used)? If its at all milky or has any adhesion to the dip stick - STOP Driving it immediately - you will "wash" your crank bearings or CAM bearings and be in a world of hurt.

Another quick test if to wipe your finger around the inside of your exhaust tips - if it is "clean" - stop driving it.

Sounds like it may be a head gasket.

 

Yes, it's not magic, it's going somewhere. Snoop around as indicated. Steam/smell in exhaust or milky oil are 2 of the best giveaways.

 

My 2007 Ford F150 was loosing coolant; filled the overflow tank every month. No white smoke out the exhaust, and no puddles anywhere. Ended up being a crack in the intake manifold (plastic these days) where the coolant crossed over to the other bank of cylinders. The crack was allowing coolant getting into the air intake of the right side cylinders.
Not sure though if our Dodge's have plastic manifolds, it does appear though that my 2020 GT V6 is plastic.

 

Thank you everyone for your help. No white smoke out of the tailpipe or discoloration in the oil. Took it back to the shop and they said that the Oil Cooler Filter Assembly is where I'm leaking coolant from as well as a crack in the Intake Manifold ($900 P&L before tax). Spark plugs need to be replaced as well. Luckily no damage to the Head Gasket.

 

That is a lot better news than a cracked head or blown head gasket. Good luck 👍

 

Oh, do it yourself and save yourself over half.

 

3 Gallons in three days should have been more obvious than having to ask here. It would either look like a military smoke screen or fouled plugs. Put 3 more gallons of anything in the crank case see what happens. Mercy

 

I had already taken it to the shop about the leak and they said that they couldn't find where it was leaking from. No smoke coming from the exhaust or discoloration in the oil, hence why I asked here to see if someone more knowledgeable had any suggestions.

 

Glad it wasn't worse. So, get it fixed. and then ... Drive it like a rental!

 

I had an aftermarket radiator that had bad welds between the several cores and driver side rad tank. I could not see any visible signs of a leak (could smell it though) but I lost about 1/2 gallon of coolant in about a month. Once all the splash shields and radiator fan was removed, then I was able to see all the dried up pink antifreeze. The shields tend to hide leaks from plain view and also seem to prevent drips from showing up on the floor. Anyways glad you found your problem and that it is a relatively easy fix.

 

A crack in the manifold would be surprising, the oil cooler not uncommon when people crank down on the filter cap too hard

Might also upgrade while you are in there

A Guy