2006 Liberty 3.7L Oil Recommendations - JeepForum.com
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post #1 of 3 Old 11-21-2006, 10:25 AM Thread Starter
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Location: Merrick, NY
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2006 Liberty 3.7L Oil Recommendations

Hi All-

First post and first jeep. Bought an '06 Liberty Limited 3.7L 4X4 last month and am coming up on the 1500 mile mark. A few questions regarding oil changes and other Mx:

How long is it reccomended to leave the original oil put in the engine from the factory in? I know there's all sorts of additives etc. in there, so I don't want to remove it too soon.

I am considering switching over to synthetic oil, but again, I don't want to do it too soon or wait too long. When is a good time to switch it over, after how much break-in? Also, I've read some concerns regarding iron build-up using Mobil1 on other engines, does anyone have experience with the Mobil1 on the 3.7L?

I'm not exactly sure what grade oil is in the vehicle from factory (I'm assuming I can look that up in the manual), but what grade is preferred? Living in NY, we rarely see temps below 20 degrees F. I am told by a reliable mechanic friend who works with the Liberty routinely that 5W-20 is good for winter, but what do you all reccomend?

Any other reccomendations such as oil filter brands/types are definitely appreciated. Also, I've heard rumors about special procedures regarding tire rotation and/or replacement on a 4X4 drivetrain. Is there anything special I have to know regarding this? I figure at around 3K miles, I will want to rotate tires, but I haven't had any experience with a 4X4 before. Thanks for all input!

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post #2 of 3 Old 03-27-2007, 05:12 PM
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Not sure about the initial oil change. I would at least change it at 3000miles. maybe 2000 since its the first change and there could be slight metal particulates.

I use 5W30 which is recommended for my '06 KJ and I don't think it has changed to 5w20. 5w20 is a little thinner and may not lubricate the engine as well but you'll get a very slight increase in mpg. It was recommended for a little while for Honda's and Fords to help increase their gas mileage but I think they stopped using it a few years ago because it doesn't protect as well.

I personally don't use synthetic oil. Instead I use Castrol GTX which is a good Dino Oil and is ~$10 for a 5 quart jug at walmart. I always change my oil at 3k miles or less so I figure Dino oil is fine since I'm changing pretty frequently. I don;t like running the same filter for more than 3k miles and it would cost a lot more for synthetic. This is just my opinion many others swear by the synthetic stuff.
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post #3 of 3 Old 04-01-2007, 07:44 PM
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Run 5W30 in the winter, and 10W30 in the summer. In my GTP I run M1, but that's because I race it and it sees over 6k RPM's pretty often, the rod bearings are the weakest link when it comes to KR, so I need them protected. My other vehicles get Castrol Syntec blend, costs $15 for a 5qt. jug at walmart.

Oh, and STAY AWAY from FRAM OIL FILTERS! Purolator makes a good filter, or if you want to be cheap, get the Super Tech filters at walmart, they're not bad (much better than fram). I use purolator and delco filters on my vehicles.

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