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Unread 03-06-2013, 05:02 AM   #1
TimV
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Ok to use 5w-30 in 4.0?

As the thread title states, is it OK to use 5w-30 in the 4.0? I normally use 10w-30, but just used up my stash in the wife's car. I have a whole case of 5w-30 here, and the only vehicle that takes it is up for sale. If it's a no go, I'll stop being cheap and go buy some, but I'm hoping to be able to use what I already have.

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Unread 03-06-2013, 06:24 AM   #2
biffgnar
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I'd use it and wouldn't worry a bit.
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Unread 03-06-2013, 08:35 AM   #3
TJjeepguy
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I used 5w-30 in my 4.0 TJ the whole time I owned it (~28,000 miles) and I never ran into any issues. The previous owner may have been running It as well. I'd say go for it.
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Unread 03-06-2013, 08:36 AM   #4
mike_dippert
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5w-30 is recommended in the owners manual for <50 temps. 10w-30 for 30<. It won't hurt a thing.
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Unread 03-07-2013, 01:45 AM   #5
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Quote:
Originally Posted by mike_dippert
5w-30 is recommended in the owners manual for <50 temps. 10w-30 for 30<. It won't hurt a thing.
Used it in the same jeep for the last 15 years. I wouldn't use anything else.
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Unread 03-09-2013, 10:32 AM   #6
JeepComanche89
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What about 10-40?
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Unread 03-09-2013, 12:53 PM   #7
seattle_yj
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Quote:
Originally Posted by JeepComanche89
What about 10-40?
It's too thick for me, I would get lifter tick. Unless its winter and you live in a cold climate I would use thinner oil.
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Unread 03-09-2013, 03:14 PM   #8
JeepComanche89
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It's too thick for me, I would get lifter tick. Unless its winter and you live in a cold climate I would use thinner oil.
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Unread 03-12-2013, 05:40 AM   #9
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Thanks
More importantly, do not use cheapie oil filters. Use Wix, Napa or Mopar.
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Unread 03-12-2013, 12:52 PM   #10
ajmorell
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Quote:
Originally Posted by JeepComanche89 View Post
What about 10-40?

It's fine. I ran it for years in my 4.0

Quote:
Originally Posted by seattle_yj View Post
It's too thick for me, I would get lifter tick. Unless its winter and you live in a cold climate I would use thinner oil.
That doesn't make sense. A thicker oil helps to reduce lifter tick
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Unread 03-12-2013, 09:24 PM   #11
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Quote:
Originally Posted by ajmorell

It's fine. I ran it for years in my 4.0

That doesn't make sense. A thicker oil helps to reduce lifter tick
It makes perfect sense, thicker oil takes longer to lubricate and circulate from cold to warm. Thinner oil does not. This is my experience and opinion, you do what you want.
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Unread 03-13-2013, 08:26 AM   #12
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Originally Posted by seattle_yj View Post
It makes perfect sense, thicker oil takes longer to lubricate and circulate from cold to warm. Thinner oil does not. This is my experience and opinion, you do what you want.
Thinner oil also bleeds down faster, which is what causes lifter tick. If you were worried about cold lubrication run 5w40, it's the same viscosity as 5w30 at ambient temp.
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Unread 03-13-2013, 12:07 PM   #13
seattle_yj
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Quote:
Originally Posted by ajmorell

Thinner oil also bleeds down faster, which is what causes lifter tick. If you were worried about cold lubrication run 5w40, it's the same viscosity as 5w30 at ambient temp.
I dunno man. I would say that it's the combo of valve build up and thick oil making it all stick together. That's just my opinion, I have no science backup except that it I have found that it works in Benz, yota, and jeep engines.
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Unread 03-17-2013, 08:58 PM   #14
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Quote:
Originally Posted by TimV View Post
As the thread title states, is it OK to use 5w-30 in the 4.0? I normally use 10w-30, but just used up my stash in the wife's car. I have a whole case of 5w-30 here, and the only vehicle that takes it is up for sale. If it's a no go, I'll stop being cheap and go buy some, but I'm hoping to be able to use what I already have.
your in a cold climate area.. 5W30 should be great in your 4.0...
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Unread 03-19-2013, 03:58 PM   #15
TimV
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I already changed it out and used 5w-30. Runs exactly the same. I'll change it out again next year after another 4k miles.
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