Recommended SAE 5W30 - JeepForum.com
 
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post #1 of 6 Old 10-22-2010, 01:48 PM Thread Starter
Timotb
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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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post #2 of 6 Old 10-22-2010, 01:54 PM
Slithering_Joe
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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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post #3 of 6 Old 10-22-2010, 05:05 PM Thread Starter
Timotb
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added one quart 10W40
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post #4 of 6 Old 10-22-2010, 05:48 PM
WXman
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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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post #5 of 6 Old 10-22-2010, 06:17 PM
PNW05KJ
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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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post #6 of 6 Old 10-23-2010, 07:19 AM
DaveJKJ
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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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