I changed my oil and filter three times now. Once I left it draining overnight. I put in five quarts and check it after it sits over night the next day. The dip-stick shows it's in the MIDDLE of the safe zone. Stays there until the next oil change. I dunno where they came up with 6 quarts. I refilled with 6 quarts w/ the filter the first time. It was way too high on the dip-stick (over an inch high).

 

After removing some oil mine still shows high it is somewhere up in the bent areas of the dip stick. I have take it on the road and checked for oil foaming by running 70 miles an hour without overdrive. I ran about 40 miles pulled over and checked it by quickly pulling the dip stick it showed no foaming. I have seen motors that are overfilled, it will actually push oil out the crank seals, and valve covers. There are no signs of any problem. It kind of seems like they screwed up and made the dip stick to long?

 

It's like I stated earlier, the manual says 6 quarts. The dipstick seating level is dependent on the tube it goes into. You may have a short tube, or a long stick, or a combination of the two. Every part is not the same. I believe you are actually running low on oil. I think I'd get with factory service or an engine builder before bleeding it again.
Have you seen the size of the oil pan? There's a lot of volume there. I don't understand why someone would want to run less oil than what the manufacturer specifies...but it's your rig, do what you feel is best for it.
Me, I'm running 6 like the book says. Has anyone heard of a Jeep in the shop for having too much oil in it? I would think at least some of the members here would have that problem and would have posted it here.

 

I own, run, and work for a company that does fleet maintenance. We have to check dozens of dipsticks per week. Here is the correct method according to me. I made it up and if you don’t like it, don’t use it.

Fill engine, transmission or other dipstick equipped device to about 1 quart less than rated refill capacity. If you have to use the dipstick for filling you may as well wait 10 minutes while the tube drains out. Remove stick and wipe fully if needed. Insert dipstick under proper conditions; engine off for engine oil. Wait 5 seconds. Smoothly and efficiently remove the stick. Take a reading on both sides of the stick while holding the stick horizontal and reflecting light off the shiny oil. The reading is not the highest point, but the top of the lowest point with continuous oil. There is no “wiping off in the tube” it is picking it up in the tube in most cases. This is the most scary thing because it gives “false full” readings. If you see an air spot in the reading, the level is at the top of the lowest point you see continuous oil. Repeat the measurement process three times. If you don’t get the same reading three times keep trying until you do.

I once wrote an oil fill computer program for an engine testing machine. It was a nightmare because the engineers were constantly accusing me of misreading the oil quantity. This had nothing to do with the dipstick or tube; we were probing the pan at the dipstick tube hole. The pan stampings were off by as much as 0.75 liters. It is no surprise to me that some of you need a different quantity of oil to read full, especially when you add the variability in the tube and stick.

I absolutely agree that this (and many other) dipsticks are terrible. Why something so simple has to be changed to become so awful is beyond me. It was easier to check the oil on my 79 LTD than this engine. I guess at least they gave us a stick. Many manuals and auto transmissions now have a “lifetime” fill of oil and there is no easy provision for checking the oil. I was glad to see the dipstick on the JK for both the engine and trans.

 

Your process assumes that all dipsticks are accurate (which we know they aren't - see my post earlier in this thread) and that the recommended amount of oil relies on that potentially inaccurate dipstick. It also assumes that you should not use the recommended amount of oil as suggested by the manufacturer.

If the manufacturer states that the oil capacity, during an oil change, with a good drain and a newly installed and correct oil filter is 6 quarts for a specified engine then why would you initially make it a quart low and then bring it up to the fill line on the dipstick. If you only add a half (to bring it to full) you only have 5 1/2 quarts - clearly 1/2 quart low as specified by the manufacturer anyway. Believe me, dipsticks are NOT high tolerance machine parts by any means. Your method may be consistant among a multitude of vehicles in a fleet, but it does not mean that the oil level in the fleet vehicles is accurate by any means. It just means that they are all consistantly inaccurate. BTW, I don't mean to slam you but I just don't see your logic in this case.

So in the end...I agree to disagree :toung:

 

Bought a new Taurus in 1996. Changed the oil and filter every 5,000 miles with 1/2 quart "less" than the factory recommendation. Sold it last year with 187,000 miles on it. Never added oil between changes. If it suffered damage from running it low on oil, I was certainly unaware of it.

 

I think we should all pull our oil pans, get an accurate volume measurement. Then measure our dipsticks and tubes... then everyone post their results. From there, we plot a standard deviation curve and report our finding to Jeep QC department. Then they can say "your point is...??" Ok , I am being a smart ass, but I think this is the only way we could get a reasonable resolution to this thread. Or just keep debating.. either way works for me , all the different points of veiw are interesting and what makes this forum great!

 

i fill 5.5 qts now just to be safe. compensates for oil left behind.

 

The book says 6 QTs. that is what goes in mine. If the engine goes south it is their fault not mine. I have free oil changes for the life of the warranty(well not free,just included in the price) so the dealership is changing it and putting in what DC says,so I don't have to worry about it. If they say 6 qts. then 6 qts. it is. my .02

 

Only thing that worries me about this is that most of us have a 3 year/36k powertrain warranty.