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Unread 09-19-2013, 04:28 AM   #1
hdsport
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Oil Viscosity - Advice, Experience, Please

'08 JGC, 4.7 V-8, 77,000 mi.

I know that the Owner's book calls out a 5W-20 oil viscosity.
I would like to put in 10W-30 for my winter stay in Florida.

Anyone see a problem in using 10W-30????
Also, will be doing a 2500 mi trip from Fla to Pa and back.
I lean towards the slightly higher viscosity for the Fla heat and interstate driving.

Your advice is appreciated.

Thanks.

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Unread 09-19-2013, 04:58 AM   #2
Jeepforthewin
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IIRC a different weight oil can mess with the MDS system and cause it to not work properly.
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Unread 09-19-2013, 06:52 AM   #3
JeepN4KC
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Mine is an '07 4.7 w/ 77K miles - I have always put full syn 5W20 in it.

Trust me when I say we see some heat in my neckathewoods during the heart of summer. Not to mention, some cold in the heart of winter.

I have driven mine short and long, wheeled it pretty hard, towed with it - in all weather conditions.

5W20 is just fine - I wouldn't bother swapping oil weights.
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Unread 09-19-2013, 08:15 AM   #4
yzjwk
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Quote:
Originally Posted by Jeepforthewin View Post
IIRC a different weight oil can mess with the MDS system and cause it to not work properly.
4.7L engine = no MDS

Quote:
Originally Posted by hdsport View Post
'08 JGC, 4.7 V-8, 77,000 mi.

I know that the Owner's book calls out a 5W-20 oil viscosity.
I would like to put in 10W-30 for my winter stay in Florida.

Anyone see a problem in using 10W-30????
Also, will be doing a 2500 mi trip from Fla to Pa and back.
I lean towards the slightly higher viscosity for the Fla heat and interstate driving.

Your advice is appreciated.

Thanks.
Not sure if the requirements changed in 08 ,and wkjeeps does not list it, but my 05 owners manual and service manual state 5W30 for the 3.7/4.7L engines . But as stated above you would be fine with 5w20 . all the HEMI guys in florida and other hot climates are running it .
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Unread 09-19-2013, 08:32 AM   #5
imthehink
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You'll be fine, Iv'e been using 10w40 all all this year. And before that, I was using 10w30. Head to http://www.bobistheoilguy.com, more than you ever wanted to know about oil.
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Unread 09-19-2013, 08:42 AM   #6
JeepN4KC
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Quote:
Originally Posted by yzjwk View Post



Not sure if the requirements changed in 08 ,and wkjeeps does not list it, but my 05 owners manual and service manual state 5W30 for the 3.7/4.7L engines .
Our last WK was an '06 and it took 30 weight. They switched from 30 to 20 between '06 and '07.

Long story short - If you can squeeze more miles per gallon out of the current set-up by merely changing oil weights, then it saves the auto makers a butt load of money. The 20 weight oil yielded slightly better fuel econ (and I mean slightly) when the engineers ran the engines through their rigamarole of tests. It's a case where the results are greater than the sum of its parts. From an individual perspective the difference is less than miniscule. From a manufacturer's perspective getting the best fuel econ for your entire fleet of built vehicles goes a long way with the gub'ment.
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Unread 09-19-2013, 02:05 PM   #7
modernblueWK
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Any of those oil weights will work fine. I use 5w20 because thats what the cap says??
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Unread 09-19-2013, 05:28 PM   #8
LouC
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I use the specified 5w/20 in my Hemi but Mobil 1 syn to desk better with high summer heat.
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Unread 09-19-2013, 05:45 PM   #9
tjkj2002
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Originally Posted by modernblueWK View Post
Any of those oil weights will work fine. I use 5w20 because thats what the cap says??
Funny that is the only change they did to the engine,just changed the oil fill cap.The 4.7 was designed for 5w-30 and can use 10w30 in hotter climates with no issues.I have run into issues at work from the 3.8/3.7/4.7's running 5w-20 and 0w-20 oil,mainly high oil consumption but when switched to 5w-30 or 10w-30 the problem goes away.
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Unread 09-19-2013, 07:04 PM   #10
modernblueWK
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I use 5w20 full syn for summer wheeling and our -30 winters. No issues and no oil consumption. Im still under an extended maxcare warranty so im trying to follow the book as best i can.
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