Cobb_Sahara

I say since they measure oil changes by 3000 miles you should spend a few hours in your driveway letting the jeep run every once in a while. That should help you burn that extra half a quart you need to get them to fix it. Be sure to run the 5w-20. Wouldn't want to slow the burn.

sgmrock

I did the same thing and am getting almost 1mpg more and thought I felt more power too...curious...

Mr.T

The Xw-30 oil tends to increase compression pressure, and decrease blow-by gasses. All blow-by goes through the PCV valve to the intake, and less blow-by will reduce oil consumption because there is some oil mist entrained in the blow-by gasses.

Increasing compression and reducing blow-by tends to increase efficiency and power. Also, less oil induction allows the timing to be advanced to a more normal amount (i.e. less knock retard) which also can increase power and economy, and reduce noticeable spark knock.

gregfly

Was talking to one of my kids friends parent who happened to be a Chrysler Jeep mechanic. Mentioned my JK using oil. told him about a quart per 1000 miles or a little less. He said they see that as normal usage per their accepted specs. Go figure!

SpoonJK

I wouldn't complain as In Canada it's same treatment per 1000 km! Which is worse!

webejeepin

Sooooo it's a win win win and win going xw-30

Mr.T

No guarantee, of course. Every engine has different clearances and surface finishes, which change over time. And drivers drive differently too. Some engines may loose economy on 5w-30 or 40, some may do slightly better. I don't doubt the CAFE MPG test results are better with 5w-20, but I do doubt the same economy increase always happens in the real world, with real manufacturing tolerances and variations in wear.

For reference, I've started testing 5w-40 for better protection at extremes (high temps and/or low RPM lugging), not for oil consumption issues. Fuel economy is unchanged, the engine is noticeably quieter, and the oil analysis shows normal/low wear particles.

Cobb_Sahara

So far I went 600 miles, dealer checked the oil this morning and it was half a quart low. I'll go back in another 600 miles for them to check it gain.

tribulation138

wow this is the first time ive seen this thread. ill have to check my oil now. this is my first non japanese vehicle in a long time. Ive been used to not worrying about engine problems.

Cobb_Sahara

Hopefully you won't have a problem. There are a lot with this issue though. I would check the fluids every 1000 miles no matter if you have a problem or not. My .2 cents