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post #1 of 9 Old 09-16-2006, 05:39 PM Thread Starter
dl425
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Synthetic Oil

I have a 2005 4.0 with 9000 miles on it, it's time for an oil change and i'm thinking of switching to synthetic.
Do any of you guys use synthetic?
I'm thinking of using Mobil 1 10w-30 full synthetic, would this be alright?

Thanks


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post #2 of 9 Old 09-16-2006, 05:48 PM
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Mobil 1 seems to be the most popular as you can find it anywhere, and will work fine. If you can find it, use AMSOil.

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post #3 of 9 Old 09-17-2006, 07:54 PM
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i use mobil 1 in all my vehicles and have loved it. in my truck i noticed a power increase when i put it in my axles and drivetrain. and in my jeep i noticed smoother and quieter shifts after i put it in my tranny. the engine oil for it is easy to find yet the gear oil can be hard to find. auto zone carries it but i found oriellys doesnt.

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post #4 of 9 Old 09-17-2006, 08:12 PM
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I only use Amsoil products. But that is must my personal preference. I have tried many different syn oils, and Amsoil worked the best for me. I also run their product in my diffs, trans, and transfer case.

Ron
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post #5 of 9 Old 09-17-2006, 08:53 PM
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I think that Amsoil is the best, I run it in my Jeep, Dodge cummins, and four-wheelers, and Snowmoblies
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post #6 of 9 Old 09-17-2006, 08:56 PM Thread Starter
dl425
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Thanks everyone. I put Mobil 1 in this weekend. I'll look for Amsoil for the next change.

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post #7 of 9 Old 09-19-2006, 12:31 PM
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Quote:
Originally Posted by njbowhntr
I only use Amsoil products. But that is must my personal preference. I have tried many different syn oils, and Amsoil worked the best for me. I also run their product in my diffs, trans, and transfer case.
How did you come to that conclusion?

Any synthetic oil lubricates and maintains it's viscosity to a higher temperature than any stock Jeep engine requires.

You can't go wrong with any of them.

"When all is said and done, usually more is said."
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post #8 of 9 Old 09-19-2006, 01:35 PM
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I used to run Castrol Syntec but a couple years ago decided to try Amsoil and have been using it in the diffs as well ever since. My engine runs noticeably quieter using it. They are all an improvement over conventional oils. Redline and Royal Purple are also considered very good. There are a jillion internet sellers of Amsoil or you can buy direct so no problem finding it. I order direct and I usually receive it within a couple of days.
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post #9 of 9 Old 09-19-2006, 07:51 PM
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Quote:
Originally Posted by Bullwinkle
How did you come to that conclusion?

Any synthetic oil lubricates and maintains it's viscosity to a higher temperature than any stock Jeep engine requires.

You can't go wrong with any of them.
I did not do the test in my Jeep, but a DOHC motor I use to drive. When using Mobil 1 it took about 1500 miles before the engine started sounding lilke a logging truck on start-up. I then switched to Royal Purple, that took 3000 miles before the logging truck sound. When I use the logging truck term, I mean I could here the lifters rattle on start up due the oil completely draining into pan. With AmsOil I had 12,000 miles on it between oil changes without a peep from the motor. Some of my friends that have race motors swear by AmsOil, and nothing else. Had a friend seize a piston due to overheating. He let the motor cool completely. We actually got it to crank over again. We pulled the motor completely apart, not a scratch in the cylinder wall.

Ron
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