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Old 05-28-2010, 12:30 PM
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Switching to Synthetic Oil in High Mileage Engine

Hi, I have a 2006 WK with 99,220 miles on it that I just purchased. I have been thinking of changing over to full synthetic engine oil. I'm a little nervous as I tried this on a 2001 XJ 4.0 and had numerous leaks. Changed back and after several oil changes it stopped leaking. I know the newer engines have better gaskets but I'm still nervous. Thanks for any help with this.
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Old 05-28-2010, 12:34 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

Go ahead and try it. If you too scared to put it in then just go with regular Oil.

What type of Engine do you have?
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Old 05-28-2010, 12:39 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

Synthetics have smaller molecules than dino oil plus have cleaning agents in them, better than dino. What happened is the seals got cleaned and then leaked. You put dino back in it.. and it sealed it up again. Best thing is to switch to synthetic on a new engine with good seals... and the oil will keep them in good shape.

Swap it over... if it leaks... go back. No harm done... well unless you let it leak alot :P

If you have the HEMI... you must put synthetic oil in it for the MDS to work properly.
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Old 05-28-2010, 07:38 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

You don't need synthetic in the Hemi to work properly, but IMO it does make it work better. Both my Hemi rides have 5W-20 synthetic in them.
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Old 05-28-2010, 08:46 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

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Originally Posted by jeepgcoman View Post
You don't need synthetic in the Hemi to work properly, but IMO it does make it work better. Both my Hemi rides have 5W-20 synthetic in them.
Exactly. You do not need synthetic oil in the 5.7L HEMI, but you do need 5W-20 viscosity lube oil.

Mine also runs better on full synthetic (butt dyno method).

[You can try a synthetic blend first to see if there are any adverse indicators.]
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Old 05-28-2010, 09:08 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

Meh why cut to the chase if it runs better and is better over all (longer changing periods) why not use test tube oil? lol
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Old 05-28-2010, 10:13 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

It is better to switch over to synthetic when the engine is newer and has less wear (50-60k) or less, but go ahead and check your jeep to see if it has any oil leaks,if it doesn't than switch to synthetic and keep an eye on the oil level, you wont hurt the engine and if any leaks do appear you can either have the seals/gaskets replaced or switch back to dino oil and the leaks will seal themselves up.

My old 99 WJ with 180k v8 slightly burned and leaked oil with dino so I did not even attempt to put synthetic in it because it would've probably cause more leaks.

I went ahead and switched my 09 WK v6 with 6k miles over to synthetic so I know I wont have any problems doing it in the future. I did notice a slight increase in performance and a 1/2 mpg increase.
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Old 05-28-2010, 10:17 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

Lol I know my old 04' WJ 4.0L had about 170k before I switched to Synthetic. I ran it until 185k and sent it to the middle east! I had no problems after I switched. no Leaks, nothing. It ran a bit better.
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Old 05-29-2010, 10:01 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

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Originally Posted by Chaoul1 View Post
Lol I know my old 04' WJ 4.0L had about 170k before I switched to Synthetic. I ran it until 185k and sent it to the middle east! I had no problems after I switched. no Leaks, nothing. It ran a bit better.
Yeah but my old 99 WJs drive-train wasn't exactly in best condition and the engine wasn't maintained very well, it has so much sludge build up it was unreal(don't buy from friends) that's why I got rid of it and bought my 09.
I wanted to get a head start on switching my 09 WK to synthetic since the motor is new, every little thing helps this small V6.lol
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Old 05-30-2010, 10:52 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

Ok, my "05 has 54K and I started putting synthetic in about 6 months ago and don't think I have any leak but I'm I just throwing out money through the window or just keep it regular. I change at every 3K miles.
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Old 05-30-2010, 11:06 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

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Originally Posted by venusfan View Post
Ok, my "05 has 54K and I started putting synthetic in about 6 months ago and don't think I have any leak but I'm I just throwing out money through the window or just keep it regular. I change at every 3K miles.

Your throwing money out if your switched to synthetic and are still changing it at 3k miles, synthetic can be changed at 6k miles or a little beyond because it has additives that last longer than regular oil. Change it a 6k miles and you'll be fine and save some money.
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Old 05-30-2010, 07:31 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

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Originally Posted by venusfan View Post
Ok, my "05 has 54K and I started putting synthetic in about 6 months ago and don't think I have any leak but I'm I just throwing out money through the window or just keep it regular. I change at every 3K miles.
You should pick: dino oil & filter at 3K miles -or- synthetic oil & filter at 6K miles. Either is acceptable for your engine and Chrysler. Whichever makes you feel better, but it's not a one-way decision.

I plan on changing oil & filter every 5K miles with full synthetic. '08 WK's now have an "oil change required" EVIC message, but not to exceed 6K miles. If the message comes up earlier than 5K miles, I change it. If I can't get to it instantly, I'm not worried with synthetic oil in the crankcase.

Interesting that the 6.1L HEMI's come from the factory with synthetic but the 5.7L HEMI's didn't (as least in the '08 model year). Anybody with an '09 or '10 advise if this has changed?
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