What oil should I be running in my jeep?
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Any ole 10w30 at appropriate intervals to oil type. My OM suggests 7500 mile normal service for the 4.0 (2.5 is the 4.0 with 2 cyl chopped off). I'd re think the puro, in case you get the "high flow" version (so far every classic I ever used). I found this in my last filter, ironically running a puro now
I would use a T5/T6 Rotella with a WIX, because I do
I would use a T5/T6 Rotella with a WIX, because I do
What you are running now sounds perfect.
10w30 is what I would choose in your climate. Supertech oil is fine, and you don't have to mess with rebates or watch for sales.
There is some hysteria on here against Purolator filters but I haven't had any problems with them.
If you want to switch stuff up, that's cool too. Look for a filter with a silicone ADBV if you have any valvetrain noise at startup. Pick one with synthetic media if you want to leave it on for a year or two. Your oil cap should say SJ, try one of the 10w30 HDEOs Walmart carries now (Rotella or Delo) if you want. Stuff like that.
10w30 is what I would choose in your climate. Supertech oil is fine, and you don't have to mess with rebates or watch for sales.
There is some hysteria on here against Purolator filters but I haven't had any problems with them.
If you want to switch stuff up, that's cool too. Look for a filter with a silicone ADBV if you have any valvetrain noise at startup. Pick one with synthetic media if you want to leave it on for a year or two. Your oil cap should say SJ, try one of the 10w30 HDEOs Walmart carries now (Rotella or Delo) if you want. Stuff like that.
I would use Pennzoil conventional or Pennzoil High Mileage in 10W-30. Couple that with a FRAM Extra Guard or Tough Guard.
Any 10w-30 will work. I would confidently run Supertech in one. The 2.5 is a long lived engine and really doesn't care.
Originally Posted By: Dyusik
(2.5 is the 4.0 with 2 cyl chopped off)
Other way around
the 4.0 is a 2.5 with 2 added cylinders.
Originally Posted By: Dyusik
(2.5 is the 4.0 with 2 cyl chopped off)
Other way around
the 4.0 is a 2.5 with 2 added cylinders.
Last edited:
Originally Posted By: Dyusik
Any ole 10w30 at appropriate intervals to oil type. My OM suggests 7500 mile normal service for the 4.0 (2.5 is the 4.0 with 2 cyl chopped off).
Also a shorter stroke- the 2.5 can wind up a little better than the 4.0. But yes, they were even cast on the same foundry lines and the 2.5 blocks and heads had blank metal segments cast on one end to match the length of the 4.0, which were then cut off and re-melted for the next batch of blocks.
Any ole 10w30 at appropriate intervals to oil type. My OM suggests 7500 mile normal service for the 4.0 (2.5 is the 4.0 with 2 cyl chopped off).
Also a shorter stroke- the 2.5 can wind up a little better than the 4.0. But yes, they were even cast on the same foundry lines and the 2.5 blocks and heads had blank metal segments cast on one end to match the length of the 4.0, which were then cut off and re-melted for the next batch of blocks.
I had a 1996 Dodge Dakota with the same engine and it cared not what oil I used. I beat that truck like a rented mule and used Delo 15W-40 and usually a Wix filter. I did not have clearance to the frame to run a longer filter.
Originally Posted By: Joshua_Skinner
I had a 1996 Dodge Dakota with the same engine and it cared not what oil I used. I beat that truck like a rented mule and used Delo 15W-40 and usually a Wix filter. I did not have clearance to the frame to run a longer filter.
People love to bash it because it's low powered, but they are just as reliable as it's younger sibling the 4.0L. I have seen those things get beat on super hard off road in Jeeps and - with the exception of one or two going pop - they do hold up. By "beat on" I mean spending all day at the red line in mud and stuff.
I had a 1996 Dodge Dakota with the same engine and it cared not what oil I used. I beat that truck like a rented mule and used Delo 15W-40 and usually a Wix filter. I did not have clearance to the frame to run a longer filter.
People love to bash it because it's low powered, but they are just as reliable as it's younger sibling the 4.0L. I have seen those things get beat on super hard off road in Jeeps and - with the exception of one or two going pop - they do hold up. By "beat on" I mean spending all day at the red line in mud and stuff.
Supertech is more then fine. I prefer a WIX over an standard puro. Buy the most cost effective combo and you will be set.
I'd avoid the Purolator Classics and PureOnes still, with the whole media tearing failure issue.
I like Mobil 1 High Mileage 10W30 if you want to change it up
I like Mobil 1 High Mileage 10W30 if you want to change it up
Whatever oil the manufacturer recommends.
PYB 10/30 seems to be the E-Ticket where our 4.0's are concerned. I'd run the same in your 2.5.
Originally Posted By: DoubleWasp
PYB 10/30 seems to be the E-Ticket where our 4.0's are concerned. I'd run the same in your 2.5.
Absolutely.
Those old Jeeps will run great on just about anything but in your climate it'd be 10w30 all year round without a second thought. Pennzoil has shown itself to run very quietly in these old clatter traps.
They do like a little thicker oil as well, the Pennzoil HM would be a great choice as it's a bit thicker.
Rotella 10w30 is another Jeeper's favorite, but it tends to be noisier.
PYB 10/30 seems to be the E-Ticket where our 4.0's are concerned. I'd run the same in your 2.5.
Absolutely.
Those old Jeeps will run great on just about anything but in your climate it'd be 10w30 all year round without a second thought. Pennzoil has shown itself to run very quietly in these old clatter traps.
They do like a little thicker oil as well, the Pennzoil HM would be a great choice as it's a bit thicker.
Rotella 10w30 is another Jeeper's favorite, but it tends to be noisier.
You would be better off with M1 or PP.
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