REVIS 24

your thoughts on mobil 15-40 w for an xj?

cherokeeaddiction23

i use rotella-t 15w40, and my xj loves it, dont run it in the winter though its too thick, but for hot weather its perfect, also no more leaks!

REVIS 24

is that regular oil or synthetic? and dont they sell that at walmart?

cherokeeaddiction23

its regular, i forgot to put that, and my walmart sells it here, but ive only seen it in the gallon jugs

REVIS 24

nice yea thats what i was looking for a regular oil,i want to go with something a little thicker for the summer,and i have a slight oil leak , and i think that will cure it ...

84zmyfavorite

Mobil Super 1300 15w-40? Heck yah! Any HDEO(Heavy Duty Engine Oil) formulated for diesel engines will be optumum for a 2.5 four banger or 4.0 six because diesel oils, even the newest LE(Low Emission) diesel oils have higher levels of Zinc/Phosperous than gasoline oils of today, which is what keeps our flat tappet cam/lifter combos alive under strenuous use. Diesel oils have higher quality oil base stocks, higher quality VIs(viscosity improvers) that wont shear as quickly as gasoline oil VIs, higher levels of detergents and dispersants(keeps inside of engine cleaner, suspends soot and breaks up sludge), are designed for longer drain intervals, and are of general higher quality than gasoline oils. Makes sense when you compare the average cost of a gasoline engine vs. average cost of a diesel engine, huh? But the cost of diesel oil vs. gasoline oil of same brand usually isnt that much more. For winter, use a 5w-40 "synthetic" diesel oil for quicker pumpability. Most 5w-40 "synthetic" diesel oils are group 3 base oil formulated, which is a severely Hydrocracked dino oil, which in Japan and Europe isnt considered a synthetic. Basically a Highly refined dino oil, so not to worry about seals leaking more vs. a true synthetic. Chevron Delo 400 5w-40 and Shell Rotella T 5w-40 Group 3. Mobil 1, Amsoil, Redline, Royal Purple, Motul 5w-40 group 4 and 5(true synthetics).

REVIS 24

rotella t is synthetic???

mike

not all but you can get it in a syn,

rich

Heavy oil for a wide clearance problem it always works. the thicker the oil the more worn out the motor.

84zmyfavorite

Rotella T 5w-40 is group 3 synthetic. 15w-40 or straight 30 is conventional oil. +1 on looser clearances =thicker oil.

XJs-R-us

So what would you guys recommend during the winter?

REVIS 24

im going to stick with the 10-30w for winter ,15-40 that oils is thick as sh** in the winter

84zmyfavorite

5w-40! 5w-40! Rotella T 5w-40 or Chevron 400LE 5w-40. 5w-40, 5w-40, 5w-40!

XJs-R-us

So I should run a 5w40 in the winter, and then a 15w40 in the warmer months.
Is this correct?

Next oil change I swap over...

rich

Noooooooooooooooooooooooooooooooooooooooooooooooo