I just go my liberty a few months ago and every vehicle I have owned it has always been 10W-30. PPL on here are saying that the manual calls for 5w-30. What happens if u switch the oil weights on your next oil change or does the weight even matter that much on the liberty. Trying to stick with what the manual says to use. Thanks for your time.

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02 prelowered jeep kj limited select-trac
aftermarket rad (crack in stocker)
235/70/16 michelin LTX
Mopar hooks and Skids
BDS lift
dynomax super turbo

I run 5w30 because that is the PREFERRED weight according to the manual. It gets cold up here in the winter so it's probably best as that is what the people who made the thing recommend.

However, the manual also says that 10w30 is ACCEPTABLE. I'd probably run that if I lived in Arizona or some place like that. I'm sure it will be ok but 5w30 might be better at real cold start ups in the winter.

I feel more comfortible using what the engineers who built the engine say is preferred.

I don't see where switching weights will hurt it. I mean you could run 10w30 in summer and 5w30 in winter or 5w30 year round.

Just my opinion as I'm not an engineer.

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05 BLACK KJ - 42RLE & NP242
Skids, Hooks, Bent Rock Rail, Lifted, A/T's, etc.
NY and PA and Florida ONF Special Custom Organic Trail Rash

Apply the standards the Engineers recommend!!!

After all the designed this awsome vehicle .... right?

Schnell

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Black:
05 Limited
00 RT

Sometimes I wonder if engineers made the libby?

I use 10w-30 year around.. Gets down to the single digits and Ive never had a problem with it. I always let it sit at LEAST 1 min before starting out if its cold though..

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
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http://www.cardomain.com/id/jeepjeepster

The lighter weight oils were also called for to help improve fuel mileage. If you run a high quality synthetic 5W-30 you will be fine regardless of what climate you are running in. I wouldn't think twice about blasting across country through any climate running Amsoils 5W-30 oil. Synthetics like Amsoil are engineered to perform at super high temps And super low temps w/out any problems. There are others out there that work ok too, so just make sure you are using a good synthetic and you will be fine.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

synthetics aren't necessary, but they help. just like 5w30 helps the lubrication when the engine is cold (vs. 10w). it depends on how much you want to protect your engine. if you think 10w30 or 10w40 works for you, go for it (just remember you made the call when you hear those noises at 100,000 KM...

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My opinions & advice are taken at your own risk.
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2002 Patriot Blue KJ - Coming soon!
2006 Black LJ (Wrangler Unlimited), auto, custom skids, 3.5" Rubicon Express, Aussie D30, Rocker Guards & Cooper AT3 235x85r16
2009 Patriot Blue D2500, 5.7L Hemi, 4x4, Quad Cab
1967 Alberg 37' Masthead rigged Sloop

5w-30 next oil change it is thanks guys

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02 prelowered jeep kj limited select-trac
aftermarket rad (crack in stocker)
235/70/16 michelin LTX
Mopar hooks and Skids
BDS lift
dynomax super turbo