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Unread 04-09-2010, 04:04 PM   #1
tx99wj
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JK oil and oil filter preferences

If this forum is anything like another car forum that I am a member of, this question probably gets asked all the time. I aplogize in advance, I can't seem to get the search to work though, so maybe somone can comment here, or provide a link.

My wife's WJ died a few weeks ago, and we got a brand new 2010 JK. Really, really nice! I'm sure it's got conventional oil in it, just like the WJ always had. I'm thinking about doing the oil changes myself, and switching to fully synthetic. I read a lot of good things about Mobil 1, but never used it, because all my other vehicles are older, and I am afraid seals will start leaking because of better detergents in synthetic.
So, question is, do you guys run synthetic in your JK's, if so, what do you prefer? Viscosity? I'm in a warm climate in TX...

Also, Mobil 1 or other? How long/how many miles between oil changes? I'd really like to limit it to one oil change per year, based on 10.000 miles a year

And what's a good oil filter for the JK? I like the Purolators...

Thanks!

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Unread 04-09-2010, 06:24 PM   #2
HungryHeart
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Hey tx, I use regular motor oil, so I won't comment on that, however I do use Fram ToughGuard TG3614 oil filters exclusively because of severe drain back issues I had with most of the other oil filters. Never again had the issue with the Toughguard. Not sure if this helps, but it my 2 cents.

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Unread 04-10-2010, 06:02 AM   #3
krutj
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My JK has a fill cap on the valve cover that states- 5w-20

I know it's thin, but you have to consider your warranty.

I also feel that after 16k, the 3.8l runs kinda dirty. I change oil more frequently than needed, but that's me.

I use Mobil 1 and fram TG filters too.
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Unread 04-10-2010, 06:46 AM   #4
mandalayjim
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I use Castrol full synthetic in my JK and wife's car. Previous XJ also had synthetic and it had 126K when I sold it.
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Unread 04-10-2010, 07:10 AM   #5
Tireguy
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Big fan of Mobil 1. I'm running the 0w-20 Advanced Fuel Economy stuff right now (through the winter). Change it every 6000 miles. Is it used up? Not really, But the oil still gets dirty. I stick with the OE Mopar filters.
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Unread 04-10-2010, 07:17 AM   #6
krutj
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Quote:
Originally Posted by Tireguy View Post
Big fan of Mobil 1. I'm running the 0w-20 Advanced Fuel Economy stuff right now (through the winter). Change it every 6000 miles. Is it used up? Not really, But the oil still gets dirty. I stick with the OE Mopar filters.
I've been curious about the new 0w stuff, you liking it?

Thought I saw it was a recommended oil?
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Unread 04-10-2010, 07:35 AM   #7
owtdorz
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Mobil 1 5w20 and Mopar (Wix) filter
Every 3000 miles.
Contrary what you may hear synthetic oil does NOT change your oil change intervals.
If you do wait past 6000 miles per oil change, that will have adverse affects on your warranty.
If something should happen to your engine you will be asked to provide proof of your oil changes.
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Unread 04-10-2010, 07:40 AM   #8
Jiblet
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Some folks report low oil pressure on start up due to filters draining back. It seems some filters have anti-drainback valves that aren't up to task. I had been using either mopar (stock) or Mobil1 filters. I got the "knock" with a recent mobil filter and went back to OEM mopar.

As for 10k mile drain interval; if you drive normally then I highly doubt you can get 10k miles out of any oil. Especially in the Texas heat.

The JKs have an oil life monitor system that runs an algorithm based on parameters such as temperature, number of cold starts, revolutions, etc. etc. etc. (it does not actually taste-test the oil, just runs the numbers).

Some folks think the monitors light up "too early" (2500-3000 miles) but many never see the light and just do 5-6000 mile drains. I believe those that think the light comes on too early are just not realistic about their driving habits and that it is not too early at all.

If you get a JK, just follow the OLM but , as recommended by the manual, don't exceed a 6000 mile drain interval.

The manuals suggest 5w-20 but you could very well use 5w-30 during the hot weather down there.

I recomend using a quality brand oil (regular or synthetic)(I like synthetic), a good filter that works for you (I get OEM mopar for $5), and change it at about 5000 miles or when the OLM tells you to change.

Also, it is a good practice to drain oil by six months REGARDLESS of mileage.
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Unread 04-10-2010, 08:14 AM   #9
Thunderstrike
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Mobil-1 5W-30 & Purorator Pure One filter from Advance Auto.

Edit: Valvoline synthethic when on sale.
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Unread 04-10-2010, 09:06 AM   #10
Tireguy
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Quote:
Originally Posted by krutj View Post
I've been curious about the new 0w stuff, you liking it?

Thought I saw it was a recommended oil?
Seems to work just fine. No percieved benefits on the 'fuel economy' just yet, Time will tell.
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Unread 04-10-2010, 09:10 AM   #11
rirrgang
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5w-20 Mobil 1 and Wix extended length filter. 10k change intervals. Syn is designed to go those distances.
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Unread 04-10-2010, 10:13 AM   #12
MAJTodd
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I have some Amsoil 0w-20 and Amsoil filter waiting for my next change.
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Unread 04-10-2010, 05:24 PM   #13
Jiblet
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Quote:
Originally Posted by rirrgang View Post
5w-20 Mobil 1 and Wix extended length filter. 10k change intervals. Syn is designed to go those distances.
There is a lot more to oil life than distance driven. Engine hours, revolutions, cold starts, operating time at/below/above operating temperature, ambient temperatures, etc.

Synthetic oil is designed for low temp pour characteristics and resistance to thermal breakdown. Purity is another benefit. But it isn't really the oil that breaks down, it is the additives. And the accumulation of acids from condensation is another problem.

Don't have to believe me, send your oil for an analysis (Blackstone labs, etc.) and see how much life is left in it at 10,000 miles.

I can not think of a reputable source that suggests going more than 6 months without an oil change.

Its not the miles (or months) per se, it is the operating conditions or actual use of the engine.

Consider this rough example (lifted from a BITOG post, link below)

Mileage has little to do with how oil is monitored, here is the idea:

Car 1:
If you drive 90% of the time on the highway lets say 1500 rpm an hour.
you engine sees 90,000 revolutions in that hour and you drive 60 miles.

Car 2:
If you drive around town, profiling with 90% of your driving in 1st, 2nd, and 3rd gear, taking 4,000 rpm on average. That's 240,000 revolutions of the engine in 1 hour and you only drive 30 miles.

Taking this out to 3 months , 90 days:
Car#1 3,600,000 rpms and 5400 miles

Car#2 21,600,000 rpms and 2700 miles

This represents 1 hour of driving a day for 90 days.
Car #2 sees 6 times the engine duty of car #1 and Only half the mileage

http://www.bobistheoilguy.com/forums...1735142&page=1
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Unread 04-10-2010, 10:05 PM   #14
tx99wj
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thanks, appreciate y'all sharing experiences. I think i'll go with Mobil 1 5W30, maybe a little lighter for winter, Purolator filter, and change every 6K miiles.....
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Unread 04-11-2010, 01:07 AM   #15
badgerking
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Quote:
Originally Posted by tx99wj View Post
thanks, appreciate y'all sharing experiences. I think i'll go with Mobil 1 5W30, maybe a little lighter for winter, Purolator filter, and change every 6K miiles.....

I run the Mobil 1 synthetic with Mobil 1 filters. I run the same in my wife's 06 GC and we've never had any problems.
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