2003 Jeep Wrangler Rubicon Discussions - Questions and answers for used Jeep Wrangler - motor oil 5-30 vs 10-30

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magilla

04/30/2008, 3:45PM

motor oil 5-30 vs 10-30

i live in a hot climate is 10-30 motor oil a good oil to use

Scott1835

04/30/2008, 6:33PM

5-30.......threre's no need to use something as heavy as 10-30.

Jeff1727

04/30/2008, 7:46PM

5-30 is all around even. its thinner than 10-30, so it starts in colder weather better. but when the engine warms up, there is hardly any difference.

Zachary422

05/01/2008, 3:46AM

use thicker oil if you have alot of miles, both oils have the same viscosity cold...30 weight, then the viscosity changes when engine oil is warm 5 is then thinner than 10 w 30. there really isnt alot of difference between the two.

Yahya39

05/05/2008, 1:45AM

Define hot, and a 10w-40 is better for the 4.0. Its an old school design with big bearing clearances. The thicker oil keeps it happy.

As an FYI to the rest, the 1st # on oil is its viscosity when cold. The 2nd # is the viscosity when hot.

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