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post #1 of 109 Old 08-17-2010, 12:42 PM Thread Starter
JimTJ
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Motor Oil Choice

Hey guys,

Looking for some help as to what synthetic-blend motor oils have a good standing reputation with the 4.0's. I do not know what brand the previous owner used, so I am going to be choosing a new one.

Any oils I should be wary of before using?

Thanks in advance for any help!

I searched a lot but nothing really conclusive came up.


James
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post #2 of 109 Old 08-17-2010, 12:47 PM
freeskier93
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I use Mobil-1. People will tell you synthetic is a waste of money in the 4.0L and will cause seal leaks, but I have 116k on my 97 and it has had nothing but Mobil-1 in it and I have no leaks. Engine is also running strong. The best thing you can do though is choose an oil and stick to that same brand over the lifetime of the Jeep.

Some people will also tell you to go with oils with high (zinc?), I cant' remember. Anyway, with the flat tappets in the older 4.0 there is a certain element that helps them.
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post #3 of 109 Old 08-17-2010, 12:47 PM
Jerry Bransford
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For Alaska in the winter, I would go with a pure synthetic, like a 5W-30 or even a 0W-30 for the very coldest conditions parts of Alaska gets. For the summer, I'd go for just a standard mineral-based 5W-30 or 10W-30 like Valvoline which is a superb motor oil. I seldom recommend pure synthetic motor oils but Alaska is one of those locations where its extra cost can be justified for its extreme winter conditions.

Personally, I am not a fan of Mobil-1 for the 4.0L engine.

When you have a choice, buy American made.
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post #4 of 109 Old 08-17-2010, 01:25 PM
DevilDogDoc
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Rotella makes a full synthetic in 5/30 with as much zinc as is allowed these days to carry the SM rating, the 10/30 blend I use has almost 1400 ppm of zinc, I'm sure the full syth isn't much different.

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post #5 of 109 Old 08-17-2010, 01:28 PM
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Just put whatever is on sale in your motor. You won't be able to tell the difference anyway. I am running 10w-40 now. When I bought the jeep, the dealership had filled it up with 15w-20

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post #6 of 109 Old 08-17-2010, 01:35 PM
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Quote:
Originally Posted by Jerry Bransford View Post
For Alaska in the winter, I would go with a pure synthetic, like a 5W-30 or even a 0W-30 for the very coldest conditions parts of Alaska gets. For the summer, I'd go for just a standard mineral-based 5W-30 or 10W-30 like Valvoline which is a superb motor oil. I seldom recommend pure synthetic motor oils but Alaska is one of those locations where its extra cost can be justified for its extreme winter conditions.

Personally, I am not a fan of Mobil-1 for the 4.0L engine.
Um, Jerry the OP is in Alabama not Alaska . AL for Alabama and AK for Alaska

For the OP I run Mobil 1 high mileage 10w30 and change it every 5,000 miles. The high mileage formula has higher zinc levels. Whether or not it does better than dino oil, that is debatable. For increased peace of mind? Sure, but maybe I should get an oil analysis done and then decide from there

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post #7 of 109 Old 08-17-2010, 01:54 PM
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Quote:
Originally Posted by DevilDogDoc View Post
Rotella makes a full synthetic in 5/30 with as much zinc as is allowed these days to carry the SM rating, the 10/30 blend I use has almost 1400 ppm of zinc, I'm sure the full syth isn't much different.
The Rotella oil is good stuff, and it's a hell of a lot cheaper than zinc additives. I've been told that most any diesel oil carries enough zinc to prevent any possible cam wear...can someone verify this?

If it's worth doing, then it's worth overdoing.

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post #8 of 109 Old 08-17-2010, 02:06 PM
freeskier93
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Quote:
Originally Posted by blubaru2002 View Post
Just put whatever is on sale in your motor. You won't be able to tell the difference anyway. I am running 10w-40 now. When I bought the jeep, the dealership had filled it up with 15w-20
IMO the best thing you can do is choose a brand and stick to it. All brands at one point have sales, so as long as your patient you can always get the same oil on sale.
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post #9 of 109 Old 08-17-2010, 02:07 PM
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synteic blend 5w30 quakerstate or castrol i use...wit a thing of lucas

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post #10 of 109 Old 08-17-2010, 02:16 PM
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I use Mobil 1 EP 5w-30 that has ACEA-3 listed on back of bottle.

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post #11 of 109 Old 08-17-2010, 02:45 PM Thread Starter
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Quote:
Originally Posted by BYuen View Post
Um, Jerry the OP is in Alabama not Alaska . AL for Alabama and AK for Alaska
Quote:
Originally Posted by Jerry Bransford View Post
For Alaska in the winter, I would go with a pure synthetic, like a 5W-30 or even a 0W-30 for the very coldest conditions parts of Alaska gets. For the summer, I'd go for just a standard mineral-based 5W-30 or 10W-30 like Valvoline which is a superb motor oil. I seldom recommend pure synthetic motor oils but Alaska is one of those locations where its extra cost can be justified for its extreme winter conditions.
I was wondering why he was telling me about Alaska winters!

Thanks for all the replies guys!

I'll get the hang of the Jeep thing sooner or later and not have to ask all these simple questions. I guess we all start out that way. I sure know I did with my Subaru.

James
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post #12 of 109 Old 08-17-2010, 02:53 PM
mdm
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Quote:
Originally Posted by JimTJ View Post
I was wondering why he was telling me about Alaska winters!...
As an example of when the use of synthetic oils in our engines certainly makes sense.

Keep in mind that free advice can frequently be worth less than you pay for it.
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post #13 of 109 Old 08-17-2010, 02:58 PM
Jerry Bransford
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Quote:
Originally Posted by BYuen View Post
Um, Jerry the OP is in Alabama not Alaska . AL for Alabama and AK for Alaska
Ah **** I too quickly misread his Fairhope AL as Fairbanks AK.

When you have a choice, buy American made.
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post #14 of 109 Old 08-17-2010, 03:06 PM
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post #15 of 109 Old 08-17-2010, 03:07 PM
rquinn02011983
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Shell rotella is by far the best oil in the industry in load wear testing. We here at stewart lubricants in birmingham alabama make and sell our own industrial lubricants (greases , sml's, and ogl's) and have our own formulas. However, we run shell rotella in our service trucks and after testing through numerous products this is the "best" for southeast conditions. We run 15w40 in all of our stock sales trucks and service rigs and have an average of 300k miles on our "gassers" and more on the "diesels". We do service them all around 5-6 k miles each. I run rotella dino in my tj and have 198k miles with all origional internals with no noises at all, however when bought it had castrol syntech 10w30 and tapped. As a lubrication and mechanical engineer -use rotella.
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