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Old 05-24-2009, 01:08 PM   #13 (permalink)
theunchosen
Master EcoModder
 
Join Date: Nov 2008
Location: Cookeville, TN
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Don't drop the lead number.

Stevey is right(if not long winded lol).

The first is what viscosity the oil is cold. The second is its ability to flow hot. As long as its not really cold there or like I said you don't come screeching out of your parking space or drive way it won't matter.

The upper number 5w30 is the important part. Dropping it down will not result in more leaks(because it doesn't leak at 5 obviously. . .) It will be easier to flow. And no you don't want heavier oil for sure. When it gets too hot it won't lubricate your cylinder properly becauses the molecules are too fat and they don't flow over each other very well.

Either stick 5w30 or drop to 5w20. the 20 will net you savings on the highway because its much less difficult to move the piston(trust me), and it shouldn't cause excessive wear. But the savings are minimal. Its hard for you to push the heavier oil. . .but your engine doesn't care or hardly notices.
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