Dealer “forgot” to change the oil...

myers688

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Long story short, I went to get a “free” oil change done on my JLUS with the 3.6l a couple of weeks ago (see my other post) and they overfilled my oil. Not too surprised as this is seemingly a common occurrence.
It finally warmed up enough in Minnesota (went from -30 degrees to about 20 degrees today) for me to change my oil this weekend and put the correct amount of oil in. After completing the oil change I inspected the “old” oil, mind you I brought my Jeep in for an oil change 433 miles ago, and it was darker than black coffee!!! This leads me to believe that they never even changed the oil at the dealership when I brought my Jeep in... boy am I glad I stayed on top of it and did it myself! What would you do in this situation? Would you bring the issue up to the service manager or just let it be and avoid going back to the “stealership” at all costs?

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calemasters

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I am not sure you can go by color. Fresh oil can turn dark within a few miles due to some of the residual old oil still being in the pan and up in the heads. When you drain the engine oil, it does not all drain out. Also, some brands of oils are just darker than other oils when new.

An oil analysis would be a better way to tell.
 

AMKRubicon610

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Jeeze. Sorry that happened to you.

if it were me, I’d let the dealer’s service manager know about this, but I’d plan on doing the oil changes yourself if you can.
I’ve had more bad experiences at fca dealers than good ones and I try to take care of things myself if I can help it
 

UPGRAYEDD

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New oil will be very dark very soon. It is surprising of how fast it turns dark black.
 

Strommen95

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It's very possible, I'd even say likely that they did change the oil. It darkens fast for a variety of reasons.
 
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myers688

myers688

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I am not sure you can go by color. Fresh oil can turn dark within a few miles due to some of the residual old oil still being in the pan and up in the heads. When you drain the engine oil, it does not all drain out. Also, some brands of oils are just darker than other oils when new.

An oil analysis would be a better way to tell.
Thanks for the input! I always thought oil should stay golden colored for quite a while. I wonder what kind of oil they use at most dealers? I used Pennzoil full synthetic 0w-20 when I changed it so we will see how dark that gets.
I actually was planning on doing an oil analysis. I ordered one of the kits from black stone labs, so I will update when I get the results which may take a few weeks.
 

MtCamper

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Are you saying you were a quart over on the dipstick after the change? Why would they add a quart just to overfill it? I think they did change it but you are right, we really don't know what they put in for oil. I have a really good dealer, but still change my own oil. Way easier to do it an my leisure than through them.
 

WagzDad

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Old timers test: put a drop of the old oil in the palm of your hand and smooth it out. New oil will leave a shiny patch with virtually no highlights of the skin lines. Old oil will deposit the suspended carbon and you can clearly see the lines.
 

calemasters

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Thanks for the input! I always thought oil should stay golden colored for quite a while. I wonder what kind of oil they use at most dealers? I used Pennzoil full synthetic 0w-20 when I changed it so we will see how dark that gets.
I actually was planning on doing an oil analysis. I ordered one of the kits from black stone labs, so I will update when I get the results which may take a few weeks.

Most dealers do not add oil from quart containers. They use an oil fill hose and nozzle coming down from the ceiling that comes from a large tank or barrel. So if you watch, you never really know what oil they are putting in. Hopefully the correct oil, right? This is why I will do my own oil changes until they haul me off to the nursing home with a wrench that they can not pry from my hand.
 
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myers688

myers688

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Are you saying you were a quart over on the dipstick after the change? Why would they add a quart just to overfill it? I think they did change it but you are right, we really don't know what they put in for oil. I have a really good dealer, but still change my own oil. Way easier to do it an my leisure than through them.
I don’t know why they would do it but yes it was overfilled. I measured the oil when I drained it out and there was 6 quarts in there. Either way I will have much more peace of mind doing my own oil changes from now on.
 
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I sold engine and industrial oils for years. The color of the new oil will darken depending on the quality of the old oil, how long it had been run, and the quality of the new oil.

Also varies greatly depending on gas vs. diesel

The new oil still has it’s Full detergent package. This is what cleans deposits from inside the engine and colors the oil. Our oil was extremely high grade and had an extremely strong detergent package

If you put our oil in after using a cheaper big name oil (particularly in diesels) our oil could be black in just a few hours. It was doing exactly what it was supposed to do, clean up deposits.

This is all dependent on previous oil quality (or lack thereof) and change interval

Blackstone was an excellent lab while I was selling. You cannot judge the life or quality of oil visually

If you had Previously used a cheaper Pennzoil or Quaker State product such as you get in the $19.95 quick lube places, the new oil may well just be doing it’s job

Contrary to the opinion of some, there is a HUGE difference in quality of oils, even within the same manufacturers line
 

cbrenthus

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I agree that they probably did change the oil and it has darkened that quickly, especially since you are in a cold climate. However, this is why you always want to check the oil before and after having it changed. Years ago, my dad took his wife's car to the dealer for oil changes and would give them a case of the oil to use, and he would check before leaving the lot. Well, one time they didn't change it - someone took his case of oil and told him they changed it. He never went back.
 

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Pull the dipstick before you drive it off the lot, it should look new (not dark/black). Honestly though, I’d recommend just doing it yourself, these 3.6’s take 5 minutes and the oil can be found everywhere (best price I have found for the Pennzoil 0-w20 full synthetic is Home Depot of all places).
 

NBB

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+1 - low quality oil either before or after the change - if they changed it. What else would be free? New synthetic oil in a healthy engine shouldn’t turn that black in 400 miles - my experience.
 

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