Unlimited Burning / Losing Oil

[jkrat]

The early year jk's were common for burning oil, I have an 08 and an 09 and the 08 burns about a 1/2 a quart in between oil changes she also does abot 60 miles a day in that jeep, my 09 jku does not seem to burn much oil at all and I do about the same mileage per day. I would check for leaks if everything is dry just keep up with checking your oil and topping it off when necessary.Both of my jk's take a bit more than 5 quarts also.

[Lyon]

Doing some online research (I don't own a Wrangler) I found that there was a TSB for a leaking timing cover but those that had it fixed did not find that this was the problem. Some had mentioned the PCV Valve but it sounds more like oil blowby to me. But there is no recall or warranty that I found on it. But here is what I did find on another site for what the dealer will check for you.

Here is the official Chrysler Star case for Oil consumption. This is exactly what the dealer will refer to when your vehicle is brought in for service.

Case Number 999926737
Vehicle Issue
Suspected excessive engine oil consumption, burns oil, uses oil, with no leaks found.;Applies to most Chrysler Corporation models unless otherwise specified. Excessive engine oil usage or consumption suspected.
System or Component Abnormal Behavior / Function,Consumption / Oil Level Low But No Leak;Customer Concern (No DTCs);Engine Oil
Recommendation
NORMAL OIL CONSUMPTION: Below are industry standards for normal engine oil consumption: Mileage below 50,000: Normal oil consumption is one quart for each 1,000 miles driven. Mileage above 50,000: Normal oil consumption is one quart for each 750 miles driven. TEST TO DETERMINE ENGINE OIL CONSUMPTION: Operate engine to normal operating temperature. Fill engine oil precisely to FULL mark on dip stick gauge. Use paint pen to mark the engine oil drain plug to prevent tampering. Check engine oil level after 1.000 miles driven. Refer to normal engine oil consumption listed above. POSSIBLE CAUSES FOR EXCESSIVE ENGINE OIL CONSUMPTION: PCV OR CCV SYSTEM: Check the crankcase ventilation system for proper operation. Oil may accumulate in the throttle body or intake manifold. Also, rocker arm lubrication oil flow returns to oil pan through drainback holes in top of cylinder head. Plugged or restricted oil drainback holes may contribute to excessive oil in crankcase ventilation system. SPARK PLUGS: Examine all spark plugs to identify the affected cylinder(s). Spark plug on the affected cylinder(s) will usually be fouled or wet with engine oil. VALVE GUIDES AND VALVE STEM SEALS: Inspect valve guides on the affected cylinder(s). Replace valve stem seals on the affected cylinder(s). PISTON RINGS: Check piston rings on the affected cylinder(s). Piston rings may be too tight / worn / broken / carbon build up in the oil control ring. CYLINDER WALL: Examine the cylinder wall on the affected cylinder(s). Cylinder wall may be severely scuffed. Perform hone procedure on the cylinder wall or replace cylinder block / short engine assembly as required.

Modification Date 08/25/09 10:44 AM


About 1 qt per 1000 is normal, considering oil change intervals are getting longer and longer in the industry this is something to think about. Technically on a 6,000 mile oil change with a 6 qt system it would be "acceptable" to possibly have no oil left by the time the vehicle is due for service.

Like I said, I don't own a Wrangler, just going by research I've found. Hope this helps.