What Type of Oil Do You Run In Your 4.0L? - Page 2 - JeepForum.com
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post #16 of 27 Old 07-01-2011, 08:38 PM
sitedzn
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Cam2 10w30 w/ 1 quart HD Lucas oil treatment and my $1.99 filter. Entire change costs $15. Oh ya, forgot to mention I work at the parts store & get for cost. Also, our filters have twice the pleats as a regular Fram. W/o the Lucas, costs like $12.

The Lucas was for the first time - heard good things so thought I'd give it a whirl.

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post #17 of 27 Old 07-01-2011, 09:13 PM
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Mobil 15w40
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post #18 of 27 Old 07-01-2011, 10:04 PM
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Redline 10W30
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post #19 of 27 Old 07-02-2011, 06:56 AM
YJay92
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My engine used to tick like crazy, switched to royal purple 10w30 to try it out. No more tick.

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post #20 of 27 Old 07-02-2011, 07:58 AM
jay-h
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Mobil 1 10-30 high mileage for the past 80K miles (now at 220K)

[Unless you are dealing with a specific wear problem or doing something temporary like using Seafoam just before oil change to clean things out, buy good oil but don't put in additives (this is the general recommendation of automotive engineers). Good oils come with a balance of additives (yes, they interact) and throwing something else in can actually degrade performance.]
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post #21 of 27 Old 09-10-2017, 11:58 AM
Jeep25
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Bringing up an old thread.

If you have no idea of past oil's used what oil should I use for a low mileage (40k) 2003 4.0 5 speed?
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post #22 of 27 Old 09-10-2017, 01:20 PM
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Quote:
Originally Posted by Jeep25 View Post
Bringing up an old thread.

If you have no idea of past oil's used what oil should I use for a low mileage (40k) 2003 4.0 5 speed?
Does not matter what is in it now. You can mix any motor oils, and no harm will be done. Not like the earliest attempts at synthetics. Everything is compatible these days.

High mileage oils just have leak preventatives in them Nothing special other than that. I would fix leaks instead of using those, but to each their own.

Congrats on finding a 40k YJ to call your own. Except it's not a YJ, and you're in the wrong forum. Still a 4.0 though, so same advice applies.

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post #23 of 27 Old 09-11-2017, 07:05 AM
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Avoid running snake oil.
Any decent 10w30 will be fine.
Use conventional Lucas gear oil in the diffs not synthetic per ECGS.
They say the dino sticks to gears better and provides a bit of cushion between parts. They say synthetic thins out and drips off parts faster.

"Auto racing began 5 minutes after the second car was built."
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post #24 of 27 Old 09-11-2017, 02:55 PM
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Quote:
Originally Posted by Chrisnvegas View Post
They say the dino sticks to gears better and provides a bit of cushion between parts. They say synthetic thins out and drips off parts faster.
Mia: They talk a lot, don't they?

Vincent: They certainly do.

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post #25 of 27 Old 09-11-2017, 08:47 PM
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Quote:
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Mia: They talk a lot, don't they?

Vincent: They certainly do.
They say the worst is Royal Purple.
I read the article right after I filled my diffs with... Royal Purple.
They are swearing by Lucas.
I don't know.

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post #26 of 27 Old 09-11-2017, 09:54 PM
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Mia: They talk a lot, don't they?

Vincent: They certainly do.
.
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post #27 of 27 Old 09-11-2017, 10:17 PM
2oldjeeps
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on "advice" i use shell rotella t4 reg 15w 40. notice no difference from 10/30 on pressure, 40-50 lbs .
still have piston slap..
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