Which fluids should I run?

[grayduty]

So this winter I wanna make my truck ready for anything. So I wanna put new fluids everywhere but the trans. What's the best to run in the diffs and engine. I've never changed the diffs (the rear needs it badly) and I normally run rotella 15-40 in the engine. Opinions?

[AOx4]

I use Amsoil where ever I can, but havent always. I have Amsoil in the engine, Valvoline in the diffs, and Castrol in the PS pump.

[grayduty]

Well I just put synthetic brake fluid and synthetic trans in the PS. I'm just curious about the axles and engine.

[Codum]

I run Rotella 15w40 in the engine, Vavaline Mercron V in the transmission, and never changed any other fluids. Just rolled over 434,500 miles today, engine has never been touched, orginal transmission lasted to 407,000 miles. No issues with transfer case or differentials.

[grayduty]

Wow. Congrats buddy.

[AOx4]

Originally Posted by grayduty

Well I just put synthetic brake fluid and synthetic trans in the PS. I'm just curious about the axles and engine.

Use a quality fluid with the LS additive already added (if applicaple) for your diffs, 75w-90 for D50s and D60s up front, and 74w-140 in the 10.5 in the rear.

As for engine oil EVERYONE prefers their own flavor.

Dino oil is generally perfectly fine if you intend to stick with 5,000 mile intervals, but I would HIGHLY encourage you to consider a synthetic and take advantage of the many benefits including extended intervals.

[grayduty]

I haven't touch the axles or trans or transfer case. I've heard not to touch the trans if its never been serviced. Cuz it'll mess with clearances and all that fun stuff and it'll speed up deterioration. My truck is at 286,xxx should I touch it or no? I plan on getting a bts in the near future. What about the transfer case? Touch it or not to touch it? That is the question.

[grayduty]

What's a good name synthetic for the diffs?

[Codum]

Originally Posted by grayduty

I haven't touch the axles or trans or transfer case. I've heard not to touch the trans if its never been serviced. Cuz it'll mess with clearances and all that fun stuff and it'll speed up deterioration. My truck is at 286,xxx should I touch it or no? I plan on getting a bts in the near future. What about the transfer case? Touch it or not to touch it? That is the question.

If your transmission is an auto you need to change the fluid and filter every 30,000 miles.

[grayduty]

Well I bought the truck with 117,xxx and I never had any maintenance logs or receipts or anything. So I'm going off the premise that its never been touched.