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Old 02-22-2012, 01:23 PM   #1
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Using synthetic in a newly acquired used TJ???

I just bought a 2006 TJ with a 4.0 that has 69k miles on it. It looks like it was treated pretty well but I don't know what kind of oil the former owner used.
I personally want to use synthetic. Any issues with just going to straight synthetic or should I do a blend first, or something else?

As far as I know, the former owner may have used synthetic.


Also, I bought some Autolight iridium plugs for it, anyone use those? What are your thoughts?

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Old 02-22-2012, 01:25 PM   #2
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You can switch to or away from synthetic engine oil at any point and at any mileage. You can even mix synthetic and conventional engine oils together. Personally I won't pay extra to run synthetic unless I'm in the dead of winter in an uber-cold location where synthetic is worth it but that's just me.

Autolite's XP-985 Iridium plug is a superb plug and a very good choice. Apply a dab of antiseize to the threads (keep it away from the electrodes) to make sure they don't stick in place since they'll be there a long time. An Autolite rep I know said he pulled his Iridiums at 165K miles to check on them and there was no detectable gap/electrode erosion or wear on them. Iridiums are the best performing and longest lasting plugs I am aware of.

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Old 02-22-2012, 04:21 PM   #3
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I ran synthetic in my old Ranger for the 11 years that I had it, truck never failed me. I drove it out 2 hours from home to turn it over to it's new owner Sunday and she ran as good as the day I bought her. Only part outside of plugs, wires, etc that I had to replace in 105k miles was the water pump... so I kind of like the idea of using synthetic. Not saying that she would have done any worse on traditional oil, but she sure as hell did well on it.

As for plugs, I used to push iridium on my customers when I worked at Autozone. I liked them and all of my customers that bought them loved em. I just didn't know how well the Autolights would work in a 4.0, I know some engines are picky about certain plugs... my Ranger almost died when I put Bosch in it one time. They only lasted about three months before I replaced them.
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Old 02-22-2012, 04:28 PM   #4
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A little tip a mechanic friend told me. Especially for engines approaching and exceeding 100,000 miles.

"If your engine has any kind of small oil leak, synthetic oil will find it, and make it bigger."

I had a small rear main seal leak on my old F-250 running synthetic oil. Switched back to Dino oil and the leak all but disappeared.

Nothing but dead dinosaurs in my rigs from then on.
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Old 02-22-2012, 04:29 PM   #5
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Synthetics are designed for extreme cold weather and high performance engines but are still fine in your Jeep. Me, I buy whatever is on sale (as long as it's API certified), which means fossil fuels, and change it every 4k miles or so. I learned this from my dad who was a diesel mechanic for close to 50 years. Never had an oil related problem in the 37 years I've been driving.
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Old 02-22-2012, 04:35 PM   #6
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I have been running the synthetic for a while now ----no complaints and I go 5K between oil changes. No valve noise anymore and it SEEMS to run better. Maybe the old placebo effect but it isn't that much more IF you watch and catch it on sale. 150K+ on my '04 TJ.
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Old 02-22-2012, 04:36 PM   #7
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Quote:
Originally Posted by TJDave View Post
A little tip a mechanic friend told me. Especially for engines approaching and exceeding 100,000 miles.

"If your engine has any kind of small oil leak, synthetic oil will find it, and make it bigger."

I had a small rear main seal leak on my old F-250 running synthetic oil. Switched back to Dino oil and the leak all but disappeared.

Nothing but dead dinosaurs in my rigs from then on.
That leak is what I am concerned with.
The Jeep currently has 69,000 miles on it. I would like to go synthetic but I am worried that it may start leaking if he used regular oil.
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Old 02-22-2012, 04:52 PM   #8
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Just use a high quality conventional, that's all I use even in my high perf SBC.
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Old 02-22-2012, 04:53 PM   #9
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That is all I use in my vehicles. I use it in my wife's truck because that is our trip vehicle, and I use it in my Mustang and Jeep because they see a lot of high rpms (bad driving habits). You can go back and forth. I like the longer intervals between changes, 5-7000 miles depending on wether I went to the track, mudding, or pulled something a lot. It supposedly does offer better startup protection and better lubrication. I put it in my jeep when I got it with 48000 I think on it and have no leaks. I would probably say it is a waste of money unless you beat on your Jeep.
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Old 02-22-2012, 06:43 PM   #10
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Quote:
Originally Posted by Jerry Bransford View Post
Autolite's XP-985 Iridium plug is a superb plug and a very good choice.
Thanks for the tip Jerry
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Old 02-22-2012, 08:54 PM   #11
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Synthetic oil is also much better at handling high heat.
If you are running off road with low tire pressure and engine temperatures are rising... synthetic is your friend offering more engine protection.
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Old 02-22-2012, 08:59 PM   #12
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If you use full synthetic oil you can't switch back to normal oil. if you use a synthetic blend you can switch back and forth.



2cents.
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Old 02-22-2012, 09:44 PM   #13
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Quote:
Originally Posted by JeepGirLHaz View Post
If you use full synthetic oil you can't switch back to normal oil.
Of course you can. Whoever told you that was simply spreading an old wive's tale.

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