Mobil 1 0W-20 synthetic oil - Page 2 - JeepForum.com

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post #16 of 19 Old 07-09-2012, 05:19 PM
tjkj2002
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Originally Posted by bagwell View Post
careful there...you might want to add.....that is your opinion.

on the flip side ---- some tests indicate that a thinner oil (like 5w-20) is much easier/lubricates better at start-up than a heavier grade and most engine damage is done on start-up.
There is zero difference in start up protection between 5w-20 and 5w-30 as both start as 5 weight oil when cold.When at operating temps is when the difference is since the 5w-20 will be 20 weight and 5w-30 will be 30 weight.

You want thinner oil for very cold start ups(-30 degrees and below) then you want to look at 0w-30 oil.


'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #17 of 19 Old 07-10-2012, 06:17 AM
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Originally Posted by tjkj2002 View Post
There is zero difference in start up protection between 5w-20 and 5w-30 as both start as 5 weight oil when cold.When at operating temps is when the difference is since the 5w-20 will be 20 weight and 5w-30 will be 30 weight.

You want thinner oil for very cold start ups(-30 degrees and below) then you want to look at 0w-30 oil.
yep, technically you are right ...but if you actually look/feel/touch 5w-20 vs 5w-30 I believe you really can tell the difference....that said, I moved from Denver to Houston and will probably switch to 5w-30 because its so freakin HOT here
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post #18 of 19 Old 09-19-2012, 03:21 PM
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5W-20 is just fine. That's that they designed for it. No offense, but I will trust them over any forum hero.

Thank you Jesus
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post #19 of 19 Old 09-19-2012, 06:16 PM
tjkj2002
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5W-20 is just fine. That's that they designed for it. No offense, but I will trust them over any forum hero.
The 3.7 and 4.7 was never designed for or redesigned for 5w-20.The 5.7 HEMI was when MDS was added.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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