My son has a 2014 RAM 1500 with the eco-diesel, at 60,000 miles, it has been recommended to have some of the fluids changed. Dealer is very expensive, front differential $56.50/qt calls for 1.1 liters so 2 quarts would have to be bought. Transfer case 2 quarts at $31 a quart, and finally rear diff 2.16 liters so 3 quarts at 21.41 a quart. Also slip additive 5 ounces price at $8.20. The slip additive I have no problem with it's the other lubricants seem to be a little pricey. The truck's manual states Front diff Mopar GL-5 synthetic axle lubricant SAE 75W-85 Transfer case Mopar BW44-44 transfer case fluid Rear diff Mopar synthetic gear lube 75W-140 (ms-8985) What could he use in place of the above? Or is there somewhere on the internet to buy the Mopar fluids at a better price. Thanks in advance.