motor oil 5-30 vs 10-30

25

Asked by Apr 30, 2008 at 03:45 PM about the 2003 Jeep Wrangler Rubicon

Question type: General

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

6 Answers

10

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

1 out of 1 people think this is helpful.
125

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.

2 out of 2 people think this is helpful.
335

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.

95

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.

2 out of 2 people think this is helpful.
95,155

Everything you ever wanted to know about oil and lots more --- http://www.bobistheoilguy.com/motor-oil-101/

2 out of 2 people think this is helpful.

The W stands for Winter. It is the viscosity on a cold start. When the engine reaches operating temperature, the viscosity is the second number.

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