Originally Posted by carazola
Hey gang, ill have to post some picks soon. im new to diesel ownership and noticed you guy really promote the changing of all fluids. my question is how often and why. i have also read some posts that have a lot of terminology that is well..... i dont get it ! So, as a green horn to diesel talk, let me have it.
truck: 2001 f350 cclb
170000 miles, purchased from dealership $16k
Well if you just get a truck always a good idea to change ALL the fluids unless you can vouch how old they are.
Oil: I run mine for 5-7500 miles, right now I have Delvac 15w40 in mine. The owner's manual calls for 3k/5k intervals but I don't run CF-4 (industry standard at the time my manual was written, diesel oil has come a LONG way since then) oil and nothing has gone BOOM yet. I do have a UOA in the mail to monitor.
Trans: Assuming a 4r100, I run basic Dex/Merc, lubegard and do a cooler line flush every 30k miles.
Front and Rear Diffs: 75w90 and 75w140 respectively and I change them every 50-75k
Power Steering: Dex/Merc and once a year
Brake: DOT 3, once a year
X-case: Dex/Merc, once a year
Coolant: You can run Green or Gold (aka Hoat, Zerex G-05) with an SCA, ELC (usually red meeting Cat EC-1, Cummins 14603 or Navistar B-2) or Precharged various colors. Personally I run HOAT/Gold with some SCAs, flush every 5 years. Really it doesn't matter what flavor kool-aid you put in your truck so long as you maintain it properly.