My 4.0 was nice and quiet on start up and run. I tried Amsoil Race this year because I use it in my bike and it's great. PLus a nap gold filter because I had it laying around. But now in the 4.0 I get the lifter clack on start up. What oil should I run to quiet this down? I do not remember what I had in before unfortunately. Pretty sure it was Pennzoil. I know I used a K&N oil filter.
My 98 says 5w-30, so that's what I use in it. Mine has the normal lifter clattering as well, not nearly as bad as the 2.9L V6 that's in my 1988 Ford Bronco 2 had before the engine was replaced though. Maybe add some zinc additive when you change the oil, that may help.
May not be a 'brand' issue...More likely the weight of the Amsoil Race? What weight did you put in? What's your average temp there over the next 3 months?
I was thinking the same thing. I am not sure how heavy of an oil a 4.0L can take. I did have a Ford Contour with the 4 cylinder or was it my SVT. I used a 20W-50 in it, Mobil 1. It clattered a bunch. I didn't run that oil long. Ran OK after that. (not a bash on Mobil 1).
I like to use Shell Rotella. The do make 10W-30 and 10W40. I like to use a bit higher zinc levels. I do use a NAPA oil filter. I am running Rotella T6 presently. Its a synthetic. Still, nothing wrong with conventional oils.
Also, you might lose a few MPGs with a heavier oil.
Be careful about using oil with "lots and lots of zinc" as this can easily lead to catalytic converter damage. Yes, flat tappet engines like the 4.0L need more ZDDP than more modern designs to prevent excessive valvetrain wear, but you can quickly reach a point of having too much of a good thing which can cause problems elsewhere.
Unless your bearings and oil pump are worn to where you can't keep pressure in spec, there's not much point in running oil heavier than 10w30 in these engines.
Ran Valvoline 5w-30 and a Mopar -090 filter for first 150k. Last 25k or so has been Mobil1 5w-30 syn and same -090 filter you can find for $5 at Wal-Mart. Pushing 180,000 on the odometer and no issues.
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