I believe all 4.0 SOHC engines recommend 5W-30 only I would stick with what is recommended in your owner's manual
use 5-30 imo in general, since that is what is recommended.
not to dispute, but imo 30 is still better, since it is the hot number. the cold number, the 5, is the same, so cold flow should be nearly the same. just the thickness when hot is higher, which protects the engine better. especially on these older motors, i do wonder.
yes that is accurate. the trans and PS take merc 5, or merc (obsolete), brakes do take Dot 3 (have heard of some using dot 4, have not tried), the diff takes 75-140 ONLY if you have an LS diff, in which case it also takes 2(?) oz of the fric mod, if you have an OPEN diff, it takes 80/90 just like the front, no LS additive. the transfer case does take merc LV, yes. no merc v in that, only MERC or merc LV. i forgot what it was about merc V that makes it incompatible, think it was the additive pack and maybe viscosity? i do wonder why they said not to use 5-30, since it is in the manual, and it was never superseded to my knowledge.
In these building years the 4.0 V 6 in the Explorer gets 5 W 30 anyway, the Mercury should have the same engine ;-) The V8 gets 5 W 20. That s what Ford recommends and to be on the safe side, don t use something else. ALWAYS make sure the oil you choose has also the Ford specification
i thought the v8 still had 30 it was the 4.6 that got 20 no?
I've heard 5w 20 or 30 in the v8 personally I'd run 30 just because it was built with it
20 too thin for these old motors as tolerances get larger
