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Unread 12-05-2010, 01:16 PM   #1
snobrdrkid07
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Best Oil and Oil Filter for the 4.0

Hello, I am undecided on the brand of oil and filter to get. I already run full synthetic 10w-40 and a fram filter.

I want to go to amsoil and a different brand of filter.

Does anyone know why some people put 5w-40 oil in? difference?

Thanks!

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Unread 12-05-2010, 01:18 PM   #2
Best4x4
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Anything but FRAM!!!! Mobil1, K&N, Wix, and OEM Jeep filters & 10w30 oil
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Unread 12-05-2010, 01:31 PM   #3
snobrdrkid07
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I have had so many people roast on Fram haha. wont be buying them anymore.

AMSOIL - 100% Synthetic 10W-30 Motor Oil (ATM) ??
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~ 04 WJ 4.0 | Selec-Trac 242 | MBP | OME HD 3" Lift | JKS TB | IRO Front LCA's and UCA's| Bilstein 5100's | Custom Front D.S. | Stillen Rotors/Metal Matrix Pads | Tow Package w/ 3.73's | Projectors w/ 55w HID H1 5000K Lows | Sylvania Ultra 9005 Fogs | Moog HD Steering | Kenwood eXcelon Radio | Memphis Speakers | Alpine Amps | Alpine Subs | Moog STB SS | Superchips Flashpaq | Auxiliary Transmission Cooler | Rock Lights | Light Bars ~

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~ 05 Rubicon Unlimited 4.0 | 6-Speed | Dana 44's | Air Lockers | 4.11 Gears | Rock-Trac 241OR T-Case with 4:1 4-Low | 2" Spacer Lift | 245/75/16 Kevlar MT/R's on Moabs | Hansen Offroad Steel F/R Bumpers | Warn 9000xi Winch | Edge Performance Chip | Custom CAI | Hella Off-road Lights | Cobra 29 CB | Flash Lights | Recovery Gear | Fire Extinguisher ~

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Unread 12-05-2010, 02:00 PM   #4
the88thpianoman
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Use an oversized filter, purolator L30001.
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Unread 12-05-2010, 02:10 PM   #5
compcrasher86
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Yes, anything but FRAM. The winter is coming up so if it gets really cold outside where you are consider running a 5w-30 oil because its a little less viscous and is easier on the engine especially during the warm up cycle. The 4.0 likes oils with higher zinc content so it is not uncommon for people to run diesel oil such as shell rotella or mobil turbo diesel truck oils
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Unread 12-05-2010, 02:21 PM   #6
billzcat1
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Mobil1 10W-30 High Mileage. Cheap at Walmart (5-qt jugs), high zinc/phosphorus content. The HM line is higher viscosity than a normal 10W-30 but retains very good cold flow properties and has a pour point below most 5W-30 oils...and it really quieted my 4.0 down from tractor-like levels of noise to car-like levels of noise.

Plus, with a 6,000 mile OCI it yielded a very good used oil analysis from Blackstone. The motor is at 197k, and I was using a Napa Gold filter, standard sized.
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Unread 12-05-2010, 02:25 PM   #7
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Amsoil by far will last the longest. 25,000 with the filter. PM me if you want to get some. Ill get you a good price.
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Unread 12-05-2010, 02:32 PM   #8
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I run rotella sythetic blend 10w-30 (silver jug) with wix filter
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Unread 12-05-2010, 02:49 PM   #9
compcrasher86
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I use mobil 1 high mileage in my XJ and it did make the engine sound much better both under power and at idle it just sounds much smoother. And with 160k miles having a Jeep that sounds quiet as heck is gratifying
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Unread 12-05-2010, 02:53 PM   #10
SplitNail
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This is pretty awesome!

YouTube - 600 K Mack Trucks & AMSOIL
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Unread 12-05-2010, 02:56 PM   #11
The_Scout
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What's wrong with Fram? If there is no good evidence behind it, I see no reason not to go Fram. I just changed my oil today with a Fram filter, and you guys are really concerning me. I change my oil every 3,000 miles, so I guess it won't have a Fram in it too long.
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Unread 12-05-2010, 03:02 PM   #12
the88thpianoman
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Quote:
Originally Posted by billzcat1 View Post
Mobil1 10W-30 High Mileage. Cheap at Walmart (5-qt jugs), high zinc/phosphorus content. The HM line is higher viscosity than a normal 10W-30 but retains very good cold flow properties and has a pour point below most 5W-30 oils...and it really quieted my 4.0 down from tractor-like levels of noise to car-like levels of noise.

Plus, with a 6,000 mile OCI it yielded a very good used oil analysis from Blackstone. The motor is at 197k, and I was using a Napa Gold filter, standard sized.
Extra zinc you say? I'm sold...
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Unread 12-05-2010, 03:18 PM   #13
compcrasher86
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Quote:
Originally Posted by The_Scout View Post
What's wrong with Fram? If there is no good evidence behind it, I see no reason not to go Fram. I just changed my oil today with a Fram filter, and you guys are really concerning me. I change my oil every 3,000 miles, so I guess it won't have a Fram in it too long.
Simple search for the word fram brings up the following:

http://www.jeepforum.com/forum/f19/n...ers-me-589979/
http://www.jeepforum.com/forum/f13/f...filter-809149/
http://www.jeepforum.com/forum/f197/...s-bad-1049800/
http://www.jeepforum.com/forum/f28/w...ilters-897326/

Just the fact that people have had bad experiences with them drives me away. For the money you'd be much better off with a wix or a purolator pureone or something of the equivalent.


Also, yes.. Extra zinc = GOOD!
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Unread 12-05-2010, 03:35 PM   #14
The_Scout
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Oh ****. See, this is why I hate shopping with my dad. He always looks at a product and says "They're all made the same! Just pick the cheaper one!" and runs away with a smile on his face for saving $2 on a critical part of a system. If I made the decision myself and wasn't such a noob at life, I would have bought a slightly more expensive filter. I just saw no evidence behind them before. Thank you for the eye opening filter lesson.
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Unread 12-05-2010, 03:37 PM   #15
hammerz71
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I've almost exclusively used Wix (NAPA Gold) filters for the past 20 years or so. Every once in a while I'll stick in a Purolator Pure-1 when I'm too lazy to make a special trip to NAPA.

I've had four 4.0s, two in Wranglers and two in GCs and have used a good many different oils, including Royal Purple and Amsoil, but ALL have been 100% synthetic. I've had a few Blackstone analysis' run on some of them and there has never been any real significant differences in the results. As a rule I change my oil every 6k miles. Just about every test has suggested I run it up to about 7500 miles, but I don't.

IMO pick you a good filter (Mobil 1, Wix, Purolator, K&N) and a good, name brand synthetic (Amsoil, RP, Mobil, Valvoline, etc.) and change at or before 6k and you'll be fine.

Most of these "extended life oils" have very good protection properties. Amsoil for example (which is a very good product) lasts so long because it's additive package actually allows the oil to get thicker (gains viscosity) with prolonged heating and cooling. Most oils (especially conventional oils) go the other way and LOSE viscosity. While this is fantastic for long life and long term protection, this could be a bad thing in some engines. Not so much the 4.0 I6, but many newer engines, especially those with MDS or equivalent, have VERY tight tolerances. Independent tests have shown 5w-20 Amsoil to actually test out to 15w-40 after about 12,000 miles.

If you are going to run a "premium" oil and try to get longer life out of it to justify the added cost, I would suggest you have your oil tested at 6k and go from there.
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