im about to change all my fluids in my 04.5 with 115000 ish miles. had 111 when i bought it and i am probably gonna run all castrol fluids in my truck. does mopar fluids matter that much on this truck. already done my research on the types of castrol i need. any help appreciated

I dont know what the dealer charges for everything but im sure its high. I would just pic whatever you want and use it, all the top 15w40 oils are good but remember factory fill for cummins is valvoline premium blue. I have been using it and baldwin bt7349 oil filter for a while and dont plan on switching anytime soon. I do suggest you get a baldwin pf7977 fuel filter because they filter to 5 microns instead of the 7 all the other filters go down to and cummins recomends 3 microns.

Transmission (Manual) is the only one I suggest the Mopar fluid for. The rest is common every day fluids. Engine oil 15w-40 (pick a brand)Power Steering fluid (not ATF)Transfer Case is ATF+4 but ATF+3 will work also.Axles 80w-90 GL-5 Gear lube is fine.Coolant (pick a brand all are good)Brake fluid (Any DOT-3)

  Mopar1973Man said:

Transmission (Manual) is the only one I suggest the Mopar fluid for. The rest is common every day fluids. Engine oil 15w-40 (pick a brand) Power Steering fluid (not ATF) Transfer Case is ATF+4 but ATF+3 will work also. Axles 80w-90 GL-5 Gear lube is fine. Coolant (pick a brand all are good) Brake fluid (Any DOT-3)

I dont know about 2nd gens but my power steering fluid is ATF and not actual power steering fluid.

  packinheat2 said:

I dont know about 2nd gens but my power steering fluid is ATF and not actual power steering fluid.

Busted... Yeah your right this is 3rd Gen... 24+ hours without sleep does some weird things to you.

are 2nd gens power steering fluid? so I know for future reference.

Yes. 1989 to 2002 is all power steering fluid.2003 and forward is ATF.

I run Amsoil in every location on my truck except brake fluid and coolant.

  AH64ID said:

I run Amsoil in every location on my truck except brake fluid and coolant.

Ditto for me........except for engine oil....................I use Valvoline Premium Blue now............mainly because I got a great deal on it a year ago and bought a case!! Otherwise it'd still be WallyWorld SuperTech!!!

Dello got me pretty far! Walmart fills everything else.

The third gens not going to like the Castrol engine oil for the diesel. Castrol to my knowledge don't make a full synthetic oil for the rearend. My '06 Cummins and the wifes '84 MB 300SD didn't appreciate the Castrol Diesel oil. I bought it on sale. Wally Worlds Supertech 15w-40 is a better oil according to the test on Turbo Diesel Registry. Castrol placed at the very bottom. Supertech was # 2 or 3 on the list With Valvoline Premium blue taking 1st spot.

  hd99fxr3 said:

The third gens not going to like the Castrol engine oil for the diesel. They also don't make a full synthetic oil for the rearend. My '06 Cummins and the wifes '84 MB 300SD didn't appreciate the Castrol Diesel oil. I bought it on sale. Wally Worlds Supertech 15w-40 is a better oil according to the test on Turbo Diesel Registry. Castrol placed at the very bottom. Supertech was # 2 or 3 on the list With Valvoline Premium blue taking 1st spot.

Who doesn't make a full synthetic 75w-90? The owners manual for my 05 states that synthetic 75w-90 is required.

  AH64ID said:

Who doesn't make a full synthetic 75w-90? The owners manual for my 05 states that synthetic 75w-90 is required.

I should have put Castrol in my reply. They may make a full Syn rear gear lube but I've never seen it.

So I guess Castrol gear lube is a no-go for 3rd gens.

  AH64ID said:

So I guess Castrol gear lube is a no-go for 3rd gens.

Well I broke down an looked, they make a full syn after all. Finding it will be the trick, unless you buy direct from a wholesaler and they order it in. None of my retailers carry it, the wholesalers have to order by the case, and you take it by the case. http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=82915494&contentId=7036193