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Unread 01-18-2014, 05:52 AM   #1
blackjeep05
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0w-20 jeep 3.8L

Anyone using 0w-20 in the Jeep 3.8L? Wondering if anyone had good success or not.

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Unread 01-18-2014, 07:23 AM   #2
Butterjeep
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Especially living in TX, I would not go 0w20. I wouldn't even go 5w20. Depending on how many miles you have on your 3.8, I would run 5w30, 10w30 or even 10w40. 5w20 was spec'd on the 3.8 to improve fuel consumption. Thinner oil flows better and takes less energy to pump (think of drinking milk through a straw vs drinking a milkshake through a straw).

So if anything, stick with the factory recommended, maybe go thicker, but I certainly would not go thinner.
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Unread 01-18-2014, 10:05 AM   #3
Jiblet
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5w-20 and 0w-20 are still both in the 20 grade at 100C, right?

You'd have to look at other aspects of the particular brand you're using. Like the hths value. The real gurus on the oil forums could tell you more than I know...

For the 3.8 in Texas there's not likely much benefit in 0w- anything.
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Unread 01-18-2014, 10:15 AM   #4
blackjeep05
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True I will probably stick with the 5w-20 I have always used. I have been running full synthetic Valvoline in everything on the JKU. Smooth as silk.
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Unread 01-18-2014, 11:31 AM   #5
Jiblet
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Quote:
Originally Posted by blackjeep05
True I will probably stick with the 5w-20 I have always used. I have been running full synthetic Valvoline in everything on the JKU. Smooth as silk.
Sounds good. What's your oil change interval?

Google: "BITOG 0w-20 vs 5w-20"
for some good info.
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Unread 01-18-2014, 12:38 PM   #6
blackjeep05
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I go about 3500 to 4k or almost 6 months which ever comes first.
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Unread 01-18-2014, 12:44 PM   #7
BacasJK
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Quote:
Originally Posted by Jiblet View Post
5w-20 and 0w-20 are still both in the 20 grade at 100C, right?

You'd have to look at other aspects of the particular brand you're using. Like the hths value. The real gurus on the oil forums could tell you more than I know...

For the 3.8 in Texas there's not likely much benefit in 0w- anything.
0w is what you want at start up since thats where the engine wears out the most. I run the 0-40w with great results. Less ticking noise at start up, because of the 0w, and the 40w to keep the oil thick at operating temperature.
Just my .02.

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Unread 01-18-2014, 01:43 PM   #8
Jiblet
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Quote:
Originally Posted by BacasJK
0w is what you want at start up since thats where the engine wears out the most. I run the 0-40w with great results. Less ticking noise at start up, because of the 0w, and the 40w to keep the oil thick at operating temperature. Just my .02. Martin
You're theoretically correct but depending on the brand oil, an 0w may not be thinner than another brands 5w at whatever the cold start temp may be. Have to check the actual PDS for the data.

For comparison, I'm told "Castrol edge 5w-20 is considerably lighter than amsoil 0w-20 at temps down to -15."
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Unread 01-19-2014, 08:54 AM   #9
SoK66
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No way I'd run that viscosity in a JK 3.8L. 5w-30 at a minimum.
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Unread 01-19-2014, 05:15 PM   #10
Nsiavosh90
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I have a 2007 sahara unlimited with 208,xxx miles on her (see my profile for the rest) and been running mobil one full synthetic 0w-20 for cold startup reasons here in Michigan. Noticeably quieter engine noise on start up, faster warm up time or at least the throttle bump on start up doesn't last that long. Can't tell if there's a fuel mileage difference. Don't see any reason not to run this in the winter in my 3.8 when normal driving conditions are all your gonna be doing. Be very very careful when wheeling though as oil temps will sneak up when in 4 low doing hi rpm low mph stuff for prolong periods of time. Will be running 5-20 for normal spring/summer driving and 10-40 for trips like silver lake sand dunes and such where I know excessive heat is going to be present
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Unread 01-19-2014, 06:11 PM   #11
BacasJK
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Quote:
Originally Posted by Nsiavosh90 View Post
I have a 2007 sahara unlimited with 208,xxx miles on her (see my profile for the rest) and been running mobil one full synthetic 0w-20 for cold startup reasons here in Michigan. Noticeably quieter engine noise on start up, faster warm up time or at least the throttle bump on start up doesn't last that long. Can't tell if there's a fuel mileage difference. Don't see any reason not to run this in the winter in my 3.8 when normal driving conditions are all your gonna be doing. Be very very careful when wheeling though as oil temps will sneak up when in 4 low doing hi rpm low mph stuff for prolong periods of time. Will be running 5-20 for normal spring/summer driving and 10-40 for trips like silver lake sand dunes and such where I know excessive heat is going to be present


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