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Unread 10-22-2010, 02:48 PM   #1
Timotb
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2005 KJ Liberty 
 
Join Date: Aug 2009
Location: Canton
Posts: 33
Recommended SAE 5W30

How important is it to use SAE 5W30 oil? It's printed right on the oil filler cap. I understand the correct tranny fluid is critical, but what about the engine oil?

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Unread 10-22-2010, 02:54 PM   #2
Slithering_Joe
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1998 TJ Wrangler 
 
Join Date: Jun 2005
Location: Nobama, Morris County, NJ
Posts: 2,443
Quote:
Originally Posted by Timotb View Post
How important is it to use SAE 5W30 oil? It's printed right on the oil filler cap. I understand the correct tranny fluid is critical, but what about the engine oil?
What did you use? If you used 10W30 (API approved) you are fine unless the temperature drops below 0*F.
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Unread 10-22-2010, 06:05 PM   #3
Timotb
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2005 KJ Liberty 
 
Join Date: Aug 2009
Location: Canton
Posts: 33
added one quart 10W40
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Unread 10-22-2010, 06:48 PM   #4
WXman
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2001 WJ 
 
Join Date: Jun 2003
Location: , Kentucky
Posts: 3,376
Considering the sludge issues the 3.7/4.7 engines are known for...I'd definitely use a lightweight, high quality oil that meets owner's manual specs.
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Unread 10-22-2010, 07:17 PM   #5
PNW05KJ
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2005 KJ Liberty 
 
Join Date: Oct 2010
Location: Woodinville, Washington
Posts: 28
I would consider Mobil One 5W 30 and stick with it. Not cheap but it's one of the best synthetics on the market.
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Unread 10-23-2010, 08:19 AM   #6
DaveJKJ
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2005 KJ Liberty 
 
Join Date: Nov 2008
Location: stuck in the mud again
Posts: 1,085
Quote:
Originally Posted by Timotb View Post
added one quart 10W40
Are you saying you had 5w30 in it and found you were a quart low and added a quart of 10w40 because that was all you had? So now you got 4 quarts of 5w30 mixed with 1 quart of 10w40 in it? If so that is better than just running it a quart low. I don't see how you would hurt anything but I would just do an oil/filter change with 5w30 before winter sets in. Also, would try to check as to why it was a quart low? Just my opinion.
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