dirtymuddog said:
i run castrol syntech, keeps great compression with lucas additive in it. usually run 10w30 in winter, 10w40 in summer. but i think next summer im gonna start runing 15w oil in all my trucks.
You beat me to it. Last weekend I changed all my fluids in my 98' 4.0L, AX15, NP231 with Red Line and love it. I used Red Line in everything but the engine where I used 5 quarts of Castrol GTX with 1 quart of Lucas and love how my oil pressure is staying up even at idle. I'm a believer. I added a little Lucas additive in with the Red Line gear oil as well.
Since you change the diffs, tranny fluid, and t-case fluid every other year, why not get the good stuff? It gives good peace of mind and is better to spend a little more on the good stuff than neglect lube and needing a new drivetrain part.
MT-90 75W90 Red Line in the AX15 3.3 Quarts
Red Line Dex 2/3 in the t-case a little over 1 Quart
75W90 Red Line diff fluid --about 1.5-2 Quarts in each diff (a little Lucas additive).
5 Quarts of Dino 10W30 (usually Quaker State SUV/High Mileage or Castrol GTX (I get at Sam's Club for less than $2/qt) and 1 quart of Lucas additive motor oil.
I use oil Fram filters with a oil magnet on the outside, I got this at Harbor Freight online (oil magnet-filters up to 2 Microns of metal particles I believe).
K&N cone filter guaranteed for Life/1 Million miles
Thanks for approximate quantities on these Kelley.