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Old 10-19-2009, 07:00 PM   #1
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Oil

So cold weather is comming,What type of oil should i be putting in my 04 4.0 Thank you!

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Old 10-19-2009, 07:03 PM   #2
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I use 10W40 all the year round.

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Old 10-20-2009, 01:23 PM   #3
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Use what the owners manual suggest for the temperature range. If they don't know who does. Opinions are like a55holes everyone has one.
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Old 10-20-2009, 01:46 PM   #4
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So cold weather is comming,What type of oil should i be putting in my 04 4.0 Thank you!
That depends on how cold it gets where you live. If it gets down to near zero (Fahrenheit), a synthetic 5W30 is a good choice. Below zero, a synthetic 0W-30 is good. Here in San Diego, I run non-synthetic 10W-40 year-round because it is usually fairly warm here. If you have a manual transmission that gets harder to shift in extra cold weather, change it to an appropriate (which depends on which manual transmission your TJ has) synthetic gear lube.
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Old 10-20-2009, 02:28 PM   #5
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I run 5w-30 all year round, it gets below zero here all the time in Vermont but 5w-30 works fine.
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Old 10-20-2009, 05:22 PM   #6
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mobile 1 5w-30 (it's synthetic if ya don't know) here in Maine.
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Old 10-20-2009, 06:08 PM   #7
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30 weight
5-30 or 10-30
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Old 10-21-2009, 09:40 PM   #8
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I use Schaeffer's synthetic year round. 10-30 summer, 5-30 winter. I also have Schaeffer's in the transmission (5 spd) and diff's.
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Old 10-21-2009, 09:48 PM   #9
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Quote:
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That depends on how cold it gets where you live. If it gets down to near zero (Fahrenheit), a synthetic 5W30 is a good choice. Below zero, a synthetic 0W-30 is good. Here in San Diego, I run non-synthetic 10W-40 year-round because it is usually fairly warm here. If you have a manual transmission that gets harder to shift in extra cold weather, change it to an appropriate (which depends on which manual transmission your TJ has) synthetic gear lube.
Is it wrong to use synthetic 10W-40 all over the year with 70-85 F in the summer and 20-40 F in the winter?
The Jeep dealers over here use only mineral 15W-40 for the whole year and I thought that synthetic 10W-40 would be better.

IMO it should be ok..

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Old 10-22-2009, 01:14 AM   #10
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A synthetic 10W-40 should be fine year-round in those conditions. I'm no big fan of synthetic engine oils but they are good in cold conditions and a synthetic 10W would be good down to a pretty cold temp. I probably wouldn't run a 15W dino in the winter.
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Old 10-22-2009, 01:37 AM   #11
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Why shouldnīt I use synthetic oil?

I always do the oil change at a gas station and they only have that oil. It costs only about 30$ for the oil and an original oil filter.

In the axles I use a mineral 80W-90 because you told us that itīs better than a synthetic.
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Old 10-22-2009, 01:49 AM   #12
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Nicolas I feel it is a old guy vs new guy thing. I have only ever run mobil 1 synthetic in my mustang jeep and f-150. The older guys prefer dino oil. I know I have done oil analysis on both dyno and synthetic dyno last about 4k depending on driving. The mustang I went to 10k on mobil 1 and I still had 40% oil life left. Take it as it is I guess. Run what ya like is my suggestion. IF you have run mobil one and love it run it. If you like something else run that. The myth of synthetic oil will make your seals on the motor leak are false too.

In the axles yes dino oil does keep them cooler. synthetic lastest longer. Toss up. I run 80-140 in my diffs (lucas oil)
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Isn't the JK just a rebodied PT Cruiser?!

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Just a few more inches Red. You can take it.


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Old 10-22-2009, 01:53 AM   #13
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diff oil doesnīt last long in my TJ. I do very much mudding and deep water crossing. I change it abou once a month. last christmasl I bought a 80L barrel and now itīs only half full.
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Old 10-22-2009, 01:59 AM   #14
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lol to funny. I wish I got to wheel that much! I run full synthetic in my mustang(everything you can think of-even water wetter for the coolant).

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Isn't the JK just a rebodied PT Cruiser?!

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Originally Posted by coyote_94yj
Just a few more inches Red. You can take it.


If you haven't gotten more out of the insurance company than you deserve, then you haven't screwed them nearly as much as they have been screwing you for the past xx years.
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