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Old 07-18-2009, 05:13 AM   #31
2000jeeper
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Amsoil 0w30
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Old 07-18-2009, 05:20 AM   #32
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penzoil......nothing special
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Old 07-18-2009, 12:46 PM   #33
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Rotella-T synthetic 5w-40 and Wix/Napa 1515 filter.
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Old 07-18-2009, 12:59 PM   #34
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Mobil1 10w-30 synthetic. I had to get a Fram filter last time as there weren't any others there, I trust cheapo fram more than walmart brand stuff. You all say the Mopar 90 fits these? What about my 2.5L, does it fit it?
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Old 07-18-2009, 01:00 PM   #35
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Originally Posted by hoosier724 View Post
this topic should be banned unless the poster has used the search!
Why?.......



Vavoline 13w-30 and Wix 51085......valvoline and wix since I was a teenager.
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Old 07-18-2009, 03:16 PM   #36
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Quote:
Originally Posted by fsSnowboard View Post
I use Mobile 1 10w30 full synthetic.
Same here.
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Old 07-18-2009, 03:27 PM   #37
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Valvoline SynPower fully synthetic 10w30
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Old 08-03-2009, 09:52 PM   #38
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I just had my 4.0 rebuilt. I was told by the shop that falling zinc (zddp) levels in oils is
Killing motors with solid lifter cams. They recommended a racing oil with high zinc. Anyone else here anything on this.
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Old 08-03-2009, 10:53 PM   #39
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mobil 10 30 with a k&n filter
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Old 08-03-2009, 10:56 PM   #40
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Quote:
Originally Posted by Elwoodblues37 View Post
I just had my 4.0 rebuilt. I was told by the shop that falling zinc (zddp) levels in oils is
Killing motors with solid lifter cams. They recommended a racing oil with high zinc. Anyone else here anything on this.
This is very true, but I don't know if you need to run racing oil. This is the reason I'm using Rotella-T synthetic diesel oil in the Jeep - much higher ZDDP and heavy detergent package. The 4.0 doesn't care that one bit that the oil weighs in at 5w40.

You may be warned about damaging your catalytic converter by running diesel oil, but in all reality you'd have to be burning a lot of it before this ever happened, and it would take a long time to do it. Besides, burning oil of any formulation is awful for a catalytic converter.

If you want to find ZDDP level comparison charts, they're out there. Fortunately, most of the quality brand pure synthetic oils for gas and diesel engines alike have maintained acceptable ZDDP levels, and you don't need to pay price premium for a racing oil to get it.

Here is a bit of an interesting read and comparison on formulations of current diesel oils, many of which will get along excellently with the 4.0: http://www.turbodieselregister.com/TDR57_Oil.pdf
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Old 08-03-2009, 11:13 PM   #41
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Castrol GTX High Mileage 10w-30
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Old 08-03-2009, 11:41 PM   #42
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Castrol GTX 10w-30
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Old 08-04-2009, 12:19 AM   #43
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Quote:
Originally Posted by JBTJ View Post
It's just a die that is added when manufactured. Looks cool I guess. When you drain it out after 3k it looks just like any other oil. Same as any other oil. Marketing hype is all that stuff is.
How purple is it? Other synthetic lubricants have a purple tint. The fully synthetic oil used in jet engines has a slight purple hue.
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Old 08-04-2009, 12:22 AM   #44
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Quote:
Originally Posted by incagoldjeep View Post
castrol gtx 10w-30 and a napa gold oil filter
x2 to a tee. Same oil and filter.
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This has got to be the first thread where a free gear upgrade was done. At the start, the OP had 3.07 gears, now he has 4.10 gears. And it didn't cost him a dime.
Show that to your dad !!
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Old 08-04-2009, 12:27 AM   #45
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Quote:
Originally Posted by ZRubicon View Post
mobil 10 30 with a k&n filter

u stole mine
Mobile 1, 10w 30, and a K&N Filter
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