Talk me out of running Sae30 in my Jeep.

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It'll burn 1.5% more fuel vs. 5w30, as long as you can live with that. So if you get 22 mpg, over 5000 miles that's 3.4 gallons, or about $10.
 
quote:
Originally posted by oilyriser:
It'll burn 1.5% more fuel vs. 5w30, as long as you can live with that. So if you get 22 mpg, over 5000 miles that's 3.4 gallons, or about $10.
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1) I wouldn't run 5W30 in a 4.0L/2.5L Jeep engine in the summer(especially 115-120 deg F - wow!). It's too thin.

2) The 4.0L won't even know the SAE30 or even the 20W50 is in there. Where did you come up with 1.5% more fuel vs 5W30 (not that his TJ would even see 22MPG)? This guy will be driving around with the AC on day or night anyway.
 
No no, it will burn exactly 2.845673% more fuel. And you'll scuff the pistons on cold starts
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And 97.654% of statistics are made up on the spot.
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In those temps SAE 30 are fine. Here in the Pacific Northwest we used to run our 6v92's on SAE 40wt all year with better results than SAE 30 or 15w40 (verified by UOA). Not that a 6V92's lube requirements apply here.
 
quote:
Originally posted by Chris142:
Ok now another one. I just went out to the garage and dug up.

2 gallons of Exxon Superflow 20w-50, 12 qts of Napa 20w-50 and 4 qts of Havoline 20w-50.

Too thick for the Jeep? I run 20w-50 in my old pickup and it does bring the oil pressure up to acceptable levels.

Save it for the truck only? What about using the 20w-50 in my air cooled quad?
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The 4.0 ..or rather the 4.2 was spec'd for 20w-50 up until the second oil crisis ..down to (I think) 32F.

Play mixologist and blend the SAE 30 with the 20w-50.
 
Realize that the SAE monogrades are likely majority Grp I base. That being said, they do not contain viscosity index improvers and are robust as long as the oil change interval is reasonable.
 
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