What Type of Oil Do You Run In Your 4.0L? - Page 2 - JeepForum.com
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post #16 of 20 Old 07-01-2011, 08:38 PM
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1988 YJ Wrangler 
Join Date: Jul 2010
Location: Chesterfield, Va
Posts: 387
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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88 YJ, 4.2L, AX-15, NP231 w/ SYE, 3.5" RC lift, 1" booms
Cut down XJ shaft in rear
Ford 8.8 LS & Spartan Locked
Big Daddy Off Road rock sliders
35x12.5 BFG A/T KOs, XRC-8000

I love installing new stuff.
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post #17 of 20 Old 07-01-2011, 09:13 PM
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1993 YJ Wrangler 
Join Date: Feb 2010
Location: al.
Posts: 122
Mobil 15w40
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post #18 of 20 Old 07-01-2011, 10:04 PM
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1993 YJ Wrangler 
Join Date: Jul 2008
Location: Henderson
Posts: 18
Redline 10W30
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post #19 of 20 Old 07-02-2011, 06:56 AM
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1992 YJ Wrangler 
Join Date: Jan 2010
Location: South Florida
Posts: 65
My engine used to tick like crazy, switched to royal purple 10w30 to try it out. No more tick.

1992 YJ, 4.0, auto, HP D30 w/TJ chromolys, 8.8 LSD, 4.10s, AA SYE, Tom Woods shaft, 5" lift, 35" MTZ's, 12k winch, Mark VIII fan, 136 amp alternator, TJ flares, custom snorkel and rock rails, no track bars or sway bar
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post #20 of 20 Old 07-02-2011, 07:58 AM
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1989 YJ Wrangler 
Join Date: Dec 2006
Posts: 5,400
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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