Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum > To Switch or Not to Switch... to Synthetic Oil

Join Wrangler Forum Today

Thread: To Switch or Not to Switch... to Synthetic Oil Reply to Thread
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
06-13-2012 02:51 AM
Originally Posted by Buz 1 View Post
i just switched to mobile 1 at 170K. treat her like u luv her...
So on the first 170K she was a pig then all of a sudden when you started paying more for oil she acted better??? I threw my wife down a flight....never mind, I'm just busting some balls after a night of drinking...

Just change it on a regular basis and add some oil when it burns some....the type of oil doesn't make a freakin difference!!! 132K and she runs fine... 3K miles...... 5K miles with half a QT or so added....still works fine..... The cheapest stuff with regular changes works fine.... High milage oil is a waste of is synthetic unless your on the track and running high HP... But again I've been drinking and I will run my baby till she dies on the cheap stuff then rebuild her and run her till she dies again...
06-12-2012 09:54 PM
scottunzicker Ok, so I lied... Going into Wally-World today, I eagerly sought out high mileage conventional oils, hoping, per my perusing of this board, to get adequate levels of that zinc stuff everyone goes on about. Well, in short, the only high-mileage stuff they had were synthetic/conventional blends. Screw it. I bought the Castrol GTX high mileage blend, did the change, started her up, and right away she sounds... smoother? Quieter? Is it entirely psychosomatic? Beats me. Anyway, it's done, and I'm off to Houston *SHUDDER* tomorrow for work.

Thanks for all the input... now... what kind of synthetic recovery rope should I get for my 12k lb. winch? Really. There's too much crap out there.
06-12-2012 08:15 AM
Jerry Bransford Conventional motor oil from major brands like Valvoline, Castrol, Pennzoil, Shell, Mobil, etc. is fine. The only time I would switch my engine oil to synthetic would be during extreme winter conditions like if I lived somewhere like Alaska, Buffalo NY, North Dakota, etc. when synthetic is worth it. In more temperate climates, modern mineral-based motor oils are excellent at completely protecting our engines. Heck even back in the 50's and 60's there were ads from Volvo and Mercedes Benz talking about customers with over a million miles on their engines... and in those days, we only had mineral based (conventional) motor oils on the store shelves.
06-11-2012 11:17 PM
scottunzicker Done - I'll go with some high mileage conventional stuff. Thanks!
06-11-2012 09:49 PM
blake32 Conventional every time if you are changing fluids that often.
06-11-2012 09:47 PM
Patrick H
other than to lighten your wallet.
Yep, about $9 an oil change. Or, ~$18 a year for me.
06-11-2012 08:59 PM
Blackpony04 Synthetic won't do a damn thing over conventional oil on a 100k engine other than to lighten your wallet. I understand HIGH MILEAGE standard oil can have benefits thanks to it having different detergents but your engine is broken in on the regular dino juice and it's best to just leave it as is. If you insist on switching at least consider compromising and going with a 50/50 blend so you won't spend as much money.

BTW, if you ever want to see a 50 foot fireball pour some synthetic oil on a burn pile and light it. My brother did that with some of my Mustang's "stool" (lol) and he thought he was going to catch his oak trees on fire!
06-11-2012 10:18 AM
scottunzicker You guys are NO HELP! *chuckle*
06-11-2012 09:13 AM
Peepers I got my 98 at around 100k miles in 07. Switched to synthetic around 115-120k and I'm pushing 130k now I believe with no issues.

Started with NAPA store brand synthetic, now I run amsoil XL
06-11-2012 08:41 AM
NC10735285 If it's not borken - don't fix it (unless you can pursuade your wife that your jeep really needs an up grade - then claim whatever is broken) use the conventional stuff.... Esepcially if you are going to change the oil on a regular basis (3-5K) why incurr the additional expense of synthetic.

If you do alot of wheeling in mud or water - you need to change ALL your fluids after a good play date - - so there again, why incurr the additional expense
06-11-2012 08:21 AM
crisjacof I ask the guys from my local 4wd and a couple of other big 4x4 shops, and they recommended me plain conventional, 10w30, for the tj.
06-11-2012 07:47 AM
Originally Posted by zeprider25 View Post
I heard if you start using synthetic in the older years after only using conventional your more prone to leaks.
Originally Posted by AZ Greeen Jeep View Post
Scott (thread author):

I just bought my first Jeep a few weeks ago: a '99 Wrangler with 100k on it. I asked the guy at my local 4wd shop, and he said the same thing as above (leaking).
This is a myth in newer vehicles that do not use cork gaskets anymore. I dont believe there are any cork gaskets on these jeeps(although I may be wrong). I have switched everything out in my 02 bought with 110k miles on it to synthetic and no leaks(that werent already there) sprouted up. Now, in older vehicles with cork gaskets, this may or may not be an issue. IMO if a gasket is going to leak, its going to leak regardless of what oil you put in it and at high miles(when this question often comes up) gaskets, of any type, are obviously more likely to leak, again regardless of what oil type is used.

And to add to this MOST "synthetic" oils sold are actually a blend that use very highly refined base stocks and are not true synthetic. The definition of synthetic was changed by the federal government a few years ago when Mobil got sued after people found out that Mobil 1 was not a true synthetic even though they claimed it to be.

There are very few true 100% synthetic oils on the market. Amsoil Signature series(their OE and XL are blends), Red Line, Royal Purple(I believe is either all 100% full or they have at least one line that is), Eneos, Joe Gibbs Racing oils, Motul, and probably a few others. Mobil 1 does not have a full synthetic oil in their lineup(at least last time I checked). You arent going to buy a full synthetic oil for less than about $9 a quart and the most expensive Mobil 1 is like $5 a quart.
06-11-2012 06:19 AM
Rayko When I bought mine it had 55K on it. No idea what the PO used but I went right to
Mobil 1. Used it in all my vehicles for the past 30 yrs. No regrets.....
06-11-2012 01:34 AM
Buz 1 i just switched to mobile 1 at 170K. treat her like u luv her...
06-11-2012 01:31 AM
AZ Greeen Jeep
Originally Posted by zeprider25 View Post
I heard if you start using synthetic in the older years after only using conventional your more prone to leaks.
Scott (thread author):

I just bought my first Jeep a few weeks ago: a '99 Wrangler with 100k on it. I asked the guy at my local 4wd shop, and he said the same thing as above (leaking).

I decided to go with conventional 10w30. I usually change the oil on all of my cars at about the 3,000 mile mark. It's probably overkill, but I've always been told that it's the cheapest insurance you can buy.

Let us know what you learn regarding synth vs conventional...I'm curious to know as well.
06-11-2012 12:29 AM
GoldenSahara00 Just use regular oil. The good old stuff always works best tried and true and reliable.
06-11-2012 12:20 AM
zeprider25 I heard if you start using synthetic in the older years after only using conventional your more prone to leaks.
06-10-2012 11:42 PM
To Switch or Not to Switch... to Synthetic Oil

I know this has been endlessly debated around here, but my "new" rig ('01, 97k miles) is due for her first oil change under my care. The previous owner has used conventional since he's had it.

In short: Should I start using full synthetic, which I'm a fan of, or go with a "if it ain't broke, don't fix it" mentality, and stick with conventional? Maybe go with a "high mileage" flavor? What's in that stuff that makes it good for high mileage vehicles, anyway?

Whatever the consensus is by tomorrow is what I'm going with.


Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 12:26 AM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC