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Unread 12-29-2012, 09:12 PM   #1
deadvolts480
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Oil weight

I put 5w 20 in stead of 10w 30in my 04 TJ my oil pressure is lower that normal should I key it be or will this hurt my engine

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Unread 01-02-2013, 12:33 AM   #2
seattle_yj
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Quote:
Originally Posted by deadvolts480
I put 5w 20 in stead of 10w 30in my 04 TJ my oil pressure is lower that normal should I key it be or will this hurt my engine
It should be fine, I've run 5w30 for the last decade and I'm on 146k miles, no issues.
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Unread 01-02-2013, 12:37 AM   #3
redaztec
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Which engine do you have? I wouldn't run 5W20 unless Jeep recommends it. for my 4.0 Jeep states either 10W30 or 5W30 is acceptable, for what it's worth.
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Unread 01-02-2013, 08:53 AM   #4
Demp
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Your oil pressure is lower because your oil is thinner and flows more easily through the engine. Thinner oil may not provide intended lubrication which can contribute to early wear. Many actually recommend going to 5W30 if you live in icy conditions, just to help the oil get through the engine until it is warm.

5W20 may be pushing it, as at running temps your oil is going to be thinner. For those who weren't aware, the numbering/weight for oil is the thickness/viscosity at a certain temperature.

For example:
SAE30 is constant at all reasonable temperatures (cold or hot)
10W30 has a weight of 10 at cooler temperatures (such as freezing) but has a weight of 30 at 210 degrees F. The W stands for "Winter".

This is done to get oil through the engine after sitting off, and as the engine warms up the oil thickens to provide more lubrication/protection.
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Unread 01-02-2013, 11:17 AM   #5
deadvolts480
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Ok thanks to all that responded. Ill be changing it very soon
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Unread 01-02-2013, 08:37 PM   #6
cruiser54
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What brand of oil filter did you use this time? What brand last time? Very important.
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