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Old 10-12-2014, 03:38 AM
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Switch to synthetics or no?

So I sold my beast I hobbled together and picked up a rather nice 95 grand limited. With the 5.2 and limited slip dana 35 rear(haven't looked at the front..... Understand it's probably the dana 30 dunno if it's also LS) full time 4wd with low range..... Lil over 150k on it. Have a glove box so full of service records it's hard to close.... Oil changes an it looks like every service record since new.... Tire rotations..... Someone's parents owned it since new an gave it to the daughter an a few months later she opts for a 4 cylinder something instead..... And I show up with a buncha cash..... Anyways.... What's the thoughts on switching to synthetics all over. Diff's and tranny an engine. Is there one I should avoid? Is there one that is magically better than all the rest?


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Old 10-12-2014, 10:13 AM
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Re: Switch to synthetics or no?

My own experience is...you can read the myriad of Forums which bounce this subject around. Syn's in the trans/diffs a good idea and will enable you to avoid changing the fluids here for quite a while if not "never".

As far as the engine, I have had higher mileage engines which were conventional oil users, than switched to "synthetics" like Mobil 1, i.e. modified dino oils. They would ooze a bit from the valve cover gaskets for a while but than pretty much stop. However, when I switched to "real" syn's like Amsoil, Castrol Euro, the gaskets oozing started and pretty much continued. My engines were in well maintained shape and no oil was needed to top them off but the oil leakage would occasionally leave a spot on the floor and coat the subframe areas.

I also like to refer to the NYC Taxi oil study, syn vs. dino, where disassembled engines showed no significant wear difference on parts. I will whole heartedly agree that turbo'd engines benefit from synthetics as far as resisting heat degradation.
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Old 10-13-2014, 05:10 PM
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Re: Switch to synthetics or no?

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Originally Posted by operative 31 View Post
So I sold my beast I hobbled together and picked up a rather nice 95 grand limited. With the 5.2 and limited slip dana 35 rear(haven't looked at the front..... Understand it's probably the dana 30 dunno if it's also LS) full time 4wd with low range..... Lil over 150k on it. Have a glove box so full of service records it's hard to close.... Oil changes an it looks like every service record since new.... Tire rotations..... Someone's parents owned it since new an gave it to the daughter an a few months later she opts for a 4 cylinder something instead..... And I show up with a buncha cash..... Anyways.... What's the thoughts on switching to synthetics all over. Diff's and tranny an engine. Is there one I should avoid? Is there one that is magically better than all the rest?


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Your call. You can go with synth blends, or you can go with pure synth.

Even though it has good service records, you might want to think about a Seafoam treatment on the engine before you cut over.

Watch out on the differentials and transfer case. The factory fluids last quite a while, and it is easier to match them up with the friction modifiers to get best operation.

Keep an eye out for the steering stabilizer, although if you start getting death wobble you really should fix the suspension parts before you replace the stabilizer.

If you have a trusted jeep specialist or dealer, take it in and ask them how much it would take to cherry it out... and the urgency. Cost ya about a hundred, which is cheap sleep insurance.
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Old 10-13-2014, 06:05 PM
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Re: Switch to synthetics or no?

It's getting lifted enough for 32's soon an new bumpers. Not making a mud machine exactly..... I'm on a island in alaska an need it to handle 2 or so feet of snow. No dealerships around an it takes a good solid 5 days to get to a dealership an back to my island so it's all getting done in my back yard.


95 Jeep Grand Cherokee limited 5.2 dodge magnum full time 4x4 sittin on dana 35 rear Dana 30 front limited slip in both.
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Old 10-14-2014, 01:10 PM
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Re: Switch to synthetics or no?

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Originally Posted by operative 31 View Post
It's getting lifted enough for 32's soon an new bumpers. Not making a mud machine exactly..... I'm on a island in alaska an need it to handle 2 or so feet of snow. No dealerships around an it takes a good solid 5 days to get to a dealership an back to my island so it's all getting done in my back yard.


95 Jeep Grand Cherokee limited 5.2 dodge magnum full time 4x4 sittin on dana 35 rear Dana 30 front limited slip in both.
I'd scout around on the internet and pick up a Factory Service Manual. Can come in handy. Would sell you one, but it went with my 95.
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