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Old 11-19-2013, 04:49 PM
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0w30 synthetic yay nay?

Anyone here run a 0w30 in the 4.7?
0w30 sufficient or to thin? And if your asking possibly which brand, it's German Castrol 0w30 green hue.
Location chicago-land
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Old 11-20-2013, 01:07 AM
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Re: 0w30 synthetic yay nay?

I did run Mobil 0W30 once, but didn't buy it again because its so overly expensive overhere.
0W30 should be a perfect oil. Cold it has a viscocity of a straight 0 oil (and cold it is in fact still too thick for perfect lubrication, but much better then any 5 or higher grade oils, since the oil flows a bit easier and the oil reaches earlier the lubrication points, so lowering the startup wear, which is by far the biggest wear factor on an engine.)
At operating temperature it has a viscocity of a straight 30 oil, which is the required one for our 4.7.
Here in Brazil the jeep stealers do run 0W30. (at least the one where i go to).
I don't know why jeep doesn't recommend this oil in the manuals, instead of the 5W30.
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Old 11-20-2013, 06:40 PM
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I currently have 10-40 for summer but winter is here and need some 0w/5w

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Old 11-30-2013, 02:14 PM
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Re: 0w30 synthetic yay nay?

FWIW I ran Mobil1 0w-30 through my jeep once. Like Frank said in theory it should be better than 5w at cold starts and the same 30 when warm. That said there was no noticeable difference to me at start up compared to the valvoline synthetic 5w-30 I was running. I now use amsoil 5w-30 and its probably mostly in my head but it does seem to run a bit better compared to the others.
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