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I'd use a good flowing synth 5w30 to reduce the strain/load on the pump.
Oil for 2006 Jeep 4.0L I-6 Rubicon ?
- Thread starter ChrisD46
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Originally Posted By: Chris142
Occasionally a piston skirt will break off a piston. No rhyme or reason and it happens to the 2.5 and 4.0.
The *ONLY* 4.0s Ihave ever seen break a piston are all 2000 and newer. I dont understand why but they seem to have it more. That is why I am worried that my 2000 is getting chattery.
The 2.5s pop when used in the mud because people will just spend all day at the red line with them in the mud.
Occasionally a piston skirt will break off a piston. No rhyme or reason and it happens to the 2.5 and 4.0.
The *ONLY* 4.0s Ihave ever seen break a piston are all 2000 and newer. I dont understand why but they seem to have it more. That is why I am worried that my 2000 is getting chattery.
The 2.5s pop when used in the mud because people will just spend all day at the red line with them in the mud.
Originally Posted By: ChrisD46
I know the 4.0L calls for 10W30 - any issues running a 5W30 synthetic year round ?
The "experts" on the Jeep forums say to stay away from any 5W-XX oil, but I'm not sure if there is any substantiation behind that. Perhaps it's because most brands of that weight of oil are meant for roller lifters and the 4.0 would still have a sliding lifter. Of the three 4.0 Jeeps that I own, I've just always run 10W30.
As far as the earlier Jeeps breaking piston skirts, one of my '96 Cherokees with the 4.0 broke a piston skirt on January 1st of this year at 1:30AM and locked the engine up tight. Talk about welcoming in the New Year...
I know the 4.0L calls for 10W30 - any issues running a 5W30 synthetic year round ?
The "experts" on the Jeep forums say to stay away from any 5W-XX oil, but I'm not sure if there is any substantiation behind that. Perhaps it's because most brands of that weight of oil are meant for roller lifters and the 4.0 would still have a sliding lifter. Of the three 4.0 Jeeps that I own, I've just always run 10W30.
As far as the earlier Jeeps breaking piston skirts, one of my '96 Cherokees with the 4.0 broke a piston skirt on January 1st of this year at 1:30AM and locked the engine up tight. Talk about welcoming in the New Year...
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The whole point of the narrower range is for supposedly thicker oil or higher hths.
Mobil1
5w30 11cSt hths 3.1
10w30 10.1cSt hths 3.0
Mobil1EP
5w30 10.6 3.0
10w30 10.2 3.1
I recommend Castrol 0w30 or Mobil1 HM 5w30
That much of a difference? Fear the 5w
Mobil1
5w30 11cSt hths 3.1
10w30 10.1cSt hths 3.0
Mobil1EP
5w30 10.6 3.0
10w30 10.2 3.1
I recommend Castrol 0w30 or Mobil1 HM 5w30
That much of a difference? Fear the 5w
I personally believe an oil with an HTHS of 3.3-3.5 is about perfect for the 4.0, but there have been several stellar UOA's posted here using PYB 10w30 at 3.1 HTHS.
KCJeep : Which oils (off the top of your head) have HTTHS's of 3.3 - 3.5 ?
Originally Posted By: KCJeep
I personally believe an oil with an HTHS of 3.3-3.5 is about perfect for the 4.0, but there have been several stellar UOA's posted here using PYB 10w30 at 3.1 HTHS.
Originally Posted By: KCJeep
I personally believe an oil with an HTHS of 3.3-3.5 is about perfect for the 4.0, but there have been several stellar UOA's posted here using PYB 10w30 at 3.1 HTHS.
Originally Posted By: Greasymechtech
The whole point of the narrower range is for supposedly thicker oil or higher hths.
Mobil1
5w30 11cSt hths 3.1
10w30 10.1cSt hths 3.0
Mobil1EP
5w30 10.6 3.0
10w30 10.2 3.1
I recommend Castrol 0w30 or Mobil1 HM 5w30
That much of a difference? Fear the 5w
No. It is for reduced vii's and a lower noack.
The whole point of the narrower range is for supposedly thicker oil or higher hths.
Mobil1
5w30 11cSt hths 3.1
10w30 10.1cSt hths 3.0
Mobil1EP
5w30 10.6 3.0
10w30 10.2 3.1
I recommend Castrol 0w30 or Mobil1 HM 5w30
That much of a difference? Fear the 5w
No. It is for reduced vii's and a lower noack.
They don't like 20w-50 ... friend of mine found that one out!
Originally Posted By: ChrisD46
KCJeep : Which oils (off the top of your head) have HTTHS's of 3.3 - 3.5 ?
Originally Posted By: KCJeep
I personally believe an oil with an HTHS of 3.3-3.5 is about perfect for the 4.0, but there have been several stellar UOA's posted here using PYB 10w30 at 3.1 HTHS.
The original Defy (now going extinct
) Pennzoil HM, Rotella, Castrol HM (guessing from the kv) and Mobil 1 HM all fall in that range in 30 grade. Many of the "Euro" type oils do too, like Castrol 0w30 for example.
KCJeep : Which oils (off the top of your head) have HTTHS's of 3.3 - 3.5 ?
Originally Posted By: KCJeep
I personally believe an oil with an HTHS of 3.3-3.5 is about perfect for the 4.0, but there have been several stellar UOA's posted here using PYB 10w30 at 3.1 HTHS.
The original Defy (now going extinct
It is showing up in a new package, and is now marked SN Resource Conserving. There is a recent long thread on here with many of us commiserating about it.
KCJeep
SOPUS
KCJeep
A happy ending to this thread would be if the OP filled up his Jeep with Pennzoil HM. . . just like the previous Jeep.
Originally Posted By: Donald
If there are no leaks and no burning oil, then no need for a HM oil. It will have seal swellers which you do not need.
I agree... that Valvoline full synthetic HM is a great oil, but not necessary if your engine is in perfect condition.
If there are no leaks and no burning oil, then no need for a HM oil. It will have seal swellers which you do not need.
I agree... that Valvoline full synthetic HM is a great oil, but not necessary if your engine is in perfect condition.
Originally Posted By: Donald
If there are no leaks and no burning oil, then no need for a HM oil. It will have seal swellers which you do not need.
If a person wanted a thicker oil in grade and also wanted the extra detergents, HM oil would be the ticket.
If there are no leaks and no burning oil, then no need for a HM oil. It will have seal swellers which you do not need.
If a person wanted a thicker oil in grade and also wanted the extra detergents, HM oil would be the ticket.
Oh not good - not having a resource conserving make up is what made Defy so well liked !!
** Just noticed your 4.0 Wrangler oil preferance KCJeep - care to expound on the ratio of 30W to MMO ?
Originally Posted By: KCJeep
It is showing up in a new package, and is now marked SN Resource Conserving. There is a recent long thread on here with many of us commiserating about it.
KCJeep
SOPUS
** Just noticed your 4.0 Wrangler oil preferance KCJeep - care to expound on the ratio of 30W to MMO ?
Originally Posted By: KCJeep
It is showing up in a new package, and is now marked SN Resource Conserving. There is a recent long thread on here with many of us commiserating about it.
KCJeep
Originally Posted By: Merkava_4
Originally Posted By: Donald
If there are no leaks and no burning oil, then no need for a HM oil. It will have seal swellers which you do not need.
If a person wanted a thicker oil in grade and also wanted the extra detergents, HM oil would be the ticket.
Yep. The "PHM" has a higher TBN than the standard PYB. Plus it's a synthetic blend for those who get turned on by that sort of thing.
Originally Posted By: Donald
If there are no leaks and no burning oil, then no need for a HM oil. It will have seal swellers which you do not need.
If a person wanted a thicker oil in grade and also wanted the extra detergents, HM oil would be the ticket.
Yep. The "PHM" has a higher TBN than the standard PYB. Plus it's a synthetic blend for those who get turned on by that sort of thing.
Originally Posted By: ChrisD46
Oh not good - not having a resource conserving make up is what made Defy so well liked !!
** Just noticed your 4.0 Wrangler oil preferance KCJeep - care to expound on the ratio of 30W to MMO ?
Originally Posted By: KCJeep
It is showing up in a new package, and is now marked SN Resource Conserving. There is a recent long thread on here with many of us commiserating about it.
KCJeep
SOPUS
I run MMO at 20% as suggested, doing some cleaning and always tinkering too (thus the SAE 30). Runs great by the way.
Oh not good - not having a resource conserving make up is what made Defy so well liked !!
** Just noticed your 4.0 Wrangler oil preferance KCJeep - care to expound on the ratio of 30W to MMO ?
Originally Posted By: KCJeep
It is showing up in a new package, and is now marked SN Resource Conserving. There is a recent long thread on here with many of us commiserating about it.
KCJeep
I run MMO at 20% as suggested, doing some cleaning and always tinkering too (thus the SAE 30). Runs great by the way.
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