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Unread 09-09-2013, 06:43 AM   #1
AIRBORNE
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Oil recommendation

My WJ is new to me. It has 153,000 on the odometer. I wanna get recommendations on what oil I should start using in it. My last WJ I used Valvoline High Mileage. I've heard synthetic isn't always good for older engines. Any advice is appreciated.

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Unread 09-09-2013, 07:03 AM   #2
cruiser54
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That synthetic story is lilke a bad fart. Keeps floating around.
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Unread 09-09-2013, 07:10 AM   #3
BIGBADWOLF
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Don't lose sleep over this,any oil recommended in the owners manual will be OK. The 4.0 is basically a tractor engine so many people with high mileage use a diesel/industrial/fleet oil such as Rotella,Walmart, Tractor supply 15-40 weight.
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Unread 09-09-2013, 07:43 AM   #4
AIRBORNE
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Quote:
Originally Posted by cruiser54 View Post
That synthetic story is lilke a bad fart. Keeps floating around.
?
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Unread 09-09-2013, 07:54 AM   #5
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Quote:
Originally Posted by AIRBORNE View Post
?
That switching to synthetic in a high mileage engine causing issues like leaking etc.
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Quote:
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Unread 09-09-2013, 08:24 AM   #6
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Quote:
Originally Posted by BIGBADWOLF View Post
The 4.0 is basically a tractor engine so many people with high mileage use a diesel/industrial/fleet oil such as Rotella,Walmart, Tractor supply 15-40 weight.
The reason people (including myself) run diesel oil in older gas engines is basically because it's more similar to the oil that was around when the engines were designed than modern oils.
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Unread 09-09-2013, 09:36 AM   #7
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Quote:
Originally Posted by jp360cj View Post
The reason people (including myself) run diesel oil in older gas engines is basically because it's more similar to the oil that was around when the engines were designed than modern oils.
Yes and also because it is high in zinc and has excellent detergent cleaning properties. Zinc is beneficial to flat tappet lifters of old engines. Diesel oil has the extra detergents that will keep the 4.0 clean. The 4.0 is more related to a diesel than a modern overhead cam, close tolerance engine.
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Unread 09-09-2013, 09:50 AM   #8
AIRBORNE
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Rotella is good oil. I use it in my Duramax. They also have some Valvoline Premium Blue that is on sale now (made for diesel engine). I use 15W 40 in my Duramax. What weight would you recommend for the 4.0L?
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Unread 09-09-2013, 10:35 AM   #9
BIGBADWOLF
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Quote:
Originally Posted by AIRBORNE View Post
Rotella is good oil. I use it in my Duramax. They also have some Valvoline Premium Blue that is on sale now (made for diesel engine). I use 15W 40 in my Duramax. What weight would you recommend for the 4.0L?
Again were talking personal preference but for that many miles I would feel comfortable with 15-40 and that is what wt I use.
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Unread 09-09-2013, 11:37 AM   #10
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I run Mobile 1 or T6 5W30in my jeep, Rotella T6 5W30 in my powerstroke.
The synthetics have better additive packs to deal with going on longer change intervals. when I owned and drove big trucks (WL900, 387 pete, 379 pete, FLD 120 etc) I ran full synthetics and pulled an oil analysis at the recommended oil service interval and only changed it when it was needed. My Cat engines could go longer between changes (like 200,000 + miles) with simply changing the filters and topping off with fresh oil.

Lubrication technology has come a very long ways since even '93 which is when my YJ was born. Check out www.bobistheoilguy.com it is the JF of the oil world and has tribologists and real honest to goodness scientists that have fact based reviews and citations for there positions, not "well this is why I feel this is the best".
You'l likely never run another Fram oil filter after visiting that place....
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Unread 09-09-2013, 11:51 AM   #11
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Motor oil 101 http://www.bobistheoilguy.com/motor-oil-101/
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If you love wealth more than liberty,the tranquility of servitude more than the animating contest of freedom, go home from us in peace. We seek not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains sit lightly on your shoulders and may posterity forget that you were our countrymen.
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Thomas Jefferson

Calling Illegal Aliens "Undocumented Immigrants" is like calling drug dealers "Unlicensed Pharmacists"

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"No one provokes (attacks) me with impunity".


"Your right, the Tea Party and the OWS are the same, just like the America Revolution and the French Revolution were the same. The only problem is the American Revolution ended with Liberty, Freedom, Justice for all and a shining light upon a hill. The French Revolution ended with lynchings, guillotines, murder and socialism. So yeah, I could see how one could confuse the two..."

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Unread 09-09-2013, 12:33 PM   #12
CJ7-Tim
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Oil is Oil, buy whatever is on sale. Most premium cost oils do not provide an extra benefit that makes them worth the added cost.

Your oil change interval is more important than the oil brand or type. I use 10w-40 in the warmer months and 5w-30 in the winter.

I do recommend good quality oil filters.
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Unread 09-09-2013, 12:59 PM   #13
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Quote:
Originally Posted by schitzangiggles View Post
Your confusing the OP. The article is factual BUT you cannot buy old oil anymore....period. Rotella and wally world diesel oil both meet API latest specification which is M. The article you posted was older than that and the author said spec "L" was the latest and when spec "M" comes out it will be even better. Well, it is on the shelf now in all fleet brands so don't worry about it.
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Unread 09-09-2013, 05:05 PM   #14
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Quote:
Originally Posted by BIGBADWOLF View Post
Your confusing the OP. The article is factual BUT you cannot buy old oil anymore....period. Rotella and wally world diesel oil both meet API latest specification which is M. The article you posted was older than that and the author said spec "L" was the latest and when spec "M" comes out it will be even better. Well, it is on the shelf now in all fleet brands so don't worry about it.
I thought you preferred this oil. LOL.
shitbox-oil.jpg

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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 09-09-2013, 07:15 PM   #15
BIGBADWOLF
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Quote:
Originally Posted by cruiser54 View Post
I thought you preferred this oil. LOL.
I've looked all over and cannot find it. Maybe I need to look at yard sales!
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