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Unread 11-15-2013, 05:15 PM   #1
OffroadOran
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4.0 Winter Oil?

Hi guys,
I have a 2004 grand cherokee with the 4.0 i6. Currently im running rotella t5 10w-30 in it and it runs well. However with the colder temperatures coming (i live in northern MA and coldest it gets here is around -10), I want to make sure that the engine starts easy and that everything is getting lubricated quickly on startup.

Would I be ok running the t5 all winter? If not, would the 5w-40 t6 work better? Should I go for something like a 10w-30 synthetic or a 5w-30 oil? (I like to run synthetic or synthetic blends in it). Any recommendations?

Any input is appreciated!

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Unread 11-15-2013, 05:44 PM   #2
99_wj_QD
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Well there are two factors that go into engine oil classification: the winter/cold temperature viscosity and the actual oil "weight"...10 Winter - 30 Weight for example.

I highly recommend NOT running 40 weight oil in your engine, ever. The oil clearances of your engine were designed and tested for 30 weight oil, so just run 30 weight.

Personally I run 10w-30 in the warmer months and 5w-30 (better for cold starts when it is below 40 degrees) in the colder months. The lower winter rating means that the oil will "sludge up" less in cold temperatures. Any manufacturer will tell you to run the same oil they recommend all the time, regardless of climate, but I feel a little more comfortable starting my Jeep up with 5w-30 after the thing sat out all night in 0 degree weather.
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Unread 11-15-2013, 06:51 PM   #3
OffroadOran
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yea i figured the 5w-40 wouldnt do much good at all. And yea thats what I want to do with mine, run 10w-30 summer and 5w-30 winter. Ive seen that the Mobil 1 high mileage has good specs and they have a 5w-30 synthetic type available. Would this be a good choice for the 4.0 or is there a better option? Im really looking for longevity of the engine, I keep up with my oil changes so thats not a concern. i usually change 3k miles or less since It doesnt get driven more than 6-7k miles a year
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Unread 11-15-2013, 07:00 PM   #4
99_wj_QD
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Well I am an auto/diesel/industrial tech and the one thing that I have noticed is that no matter what type of oil or lubricant you are dealing with, the synthetic **** is not much different. Save your wallet and go back to using conventional motor oil, I'm a total Mobil1 whore so that is my preference. Don't waste your money on synthetics or high mileage crap, oil is oil, the only advantage to synthetic oil is that the oil additives will last longer but if you keep up with your oil changes then synthetic really won't be to your benefit.

If it is any help to ease your mind, I drive a 99 WJ with the 4.7, bought it used in January of 2012 with 115k on the engine. Now it has 153K on the engine and I run simple *** Mobil1 10w-30 most of the time, changing the oil every 5k or 200 engine hours, whichever comes first. Still runs like a champ, no abnormal noises at all, she purrs.
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Unread 11-15-2013, 07:18 PM   #5
OffroadOran
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Im the same way though with oils, my preference is to run something that's better.I just feel peace of mind knowing that i have a good syn blend or full syn in the jeep. I know its not -necessary- but it gives me peace of mind and it helps me sleep at night.
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Unread 11-15-2013, 08:43 PM   #6
sprocket1200
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We'll reach 155K miles this weekend on our 2001 4.0. running synthetic mobil 10w30 and T6 when I can get it. 6K mile oil changes with larger filter changed every second time.

purrs....

i think 5w30 is what you want in the colder climates. maybe even a 5w20 if you are determined to change it anyway come spring.
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Unread 11-15-2013, 10:35 PM   #7
99_wj_QD
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definitely don't want to go down to a 20 weight, the oil clearances in all the crank/cam/rod bearings and journals are machined for the thickness of 30 weight oil, any less than 30 weight is risky.
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Unread 11-16-2013, 07:48 AM   #8
OffroadOran
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yea a 5w-20 would be too thin. if anything, a 0w-30 would be the most helpful technically. But id rather not go that low, im going to stick with a 5w-30 or comparable
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Unread 11-16-2013, 08:46 AM   #9
Cirruslydakota
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Follow the temprature guidelines in the owners manual. For prolonged tempratures below freezing I'd switch to 5w-30. Since my climate is fairly mild (Maryland it rarely gets below 0) I run T5 10w-30 year round with no ill effects.
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Unread 11-16-2013, 08:38 PM   #10
OffroadOran
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Yea im going to run mobil 1 full syn high mileage 5w-30 for the winter. Its got extra zinc in it, its a lil thicker than their regular 5w-30 syn, and itll help with starts since its a 5w and not a 10w. I just gotta fix my dang oil pan drain plug that decided it wanted to break free from its internal welds and ill be all set to put this stuff in
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Unread 11-16-2013, 10:26 PM   #11
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The answer is simple...OWNERS MANUAL
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Unread 11-16-2013, 11:39 PM   #12
Jrboarder27
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Quote:
Originally Posted by BIGBADWOLF View Post
The answer is simple...OWNERS MANUAL
Not every one has or has every had an... OWNERS MANUAL!

Sent from my Galaxy S4 using JeepForum
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Unread 11-17-2013, 07:29 AM   #13
OffroadOran
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Quote:
Originally Posted by BIGBADWOLF
The answer is simple...OWNERS MANUAL
I was talking more recommendations, like if there was a specific oil that other jeepforumers run that has worked well in temps around 0 degrees fahrenheit for them. I know winter oil is supposed to be 5w-30
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Unread 11-17-2013, 10:03 AM   #14
BIGBADWOLF
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Quote:
Originally Posted by OffroadOran View Post
I was talking more recommendations, like if there was a specific oil that other jeepforumers run that has worked well in temps around 0 degrees fahrenheit for them. I know winter oil is supposed to be 5w-30
Unfortunately there are many opinions but there is no data to back any of them. The owners manual recommendation is from Engineers and not laymen so that is where I put my trust.
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Unread 11-17-2013, 11:29 AM   #15
99WJ539918
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I run 10W-30 all year even in winter months here in Jersey and I have been for over five years. My rebuilt engine has over 100K on it now and it's still quiet and idles perfect. As long as you change your oil at proper intervals you'll be fine. I run cheap conventional motor oil.
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