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Unread 07-10-2012, 10:41 AM   #1
mrny
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Join Date: Jul 2012
Location: Kalamazoo, mi
Posts: 4
Lifters Noisy

When my 05 Liberty 3.7 is shut down and I restart when it is still warm, the lifters sometimes are momentarily noisy. I wonder if I can switch from 5w30 to 10w30 for a trial . My manual says 5w30 I don't think it would hurt anything .

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Unread 07-10-2012, 06:49 PM   #2
streetglideok
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2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,415
Quote:
Originally Posted by mrny View Post
When my 05 Liberty 3.7 is shut down and I restart when it is still warm, the lifters sometimes are momentarily noisy. I wonder if I can switch from 5w30 to 10w30 for a trial . My manual says 5w30 I don't think it would hurt anything .
Umm yeah, it can actually. Your oil pump is designed to pump oil of a certain viscocity. Too thick, and you can cause damage to the pump, and the relief valve. 10w30 will be thicker cold, and about the same viscocity warm as 5w30, so with a warm engine, you gain nothing, and with cold starts, you will aggravate your problem, with an engine starving longer on start up. Valvetrain clatter is not a sign of needing thicker oil, its usually a sign of lack of proper oil change intervals, and sludge deposits building up. One more thing, 10w30 has a different additive spec, and the needs of your engine will surpass what that oil can deliver.
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Unread 07-11-2012, 08:05 PM   #3
tjkj2002
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2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,114
You can use either 5w-30 or 10w-30 in the 3.7,just don't use 10w-30 below 32 degrees is all.

I run 10w-30 synthetic on road trips if not in the winter time,5w-30 synthetic the rest of the time and my engine has a loud tick that has been there since mile 3 on the ODO.With 5w-30 syn on a cold start up at 70 degrees outside temp I start with almost 90psi of oil pressure,over 100psi with 10w-30 syn.
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