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3.0l CATA Oil Overfilled

1983 Views 80 Replies 10 Participants Last post by  Michaelmg
I picked up a 2012 TDI Sport+Nav with 148k miles on the odometer a couple weeks ago and when I picked it up, before driving it 8hrs home, I checked the dipstick and found the oil level right where I wanted it and drove it home.

That was about 1200 mi ago, and I just got around to my first oil change and I noticed that the amount of oil that came out seemed high; it almost overflowed my drain pan. I didn't think too much of it, being new to diesel ownership. Well, I got the rest of the oil change done. put 7.5 quarts of oil in the fill and pulled out a 100% dry dipstick.

I put in another quart thinking I just wasn't quite seeing it yet. Pulled out another bone dry dipstick. At this point I was scratching my head trying to figure out what had happened. Had the new oil not made it's way back into the pan somehow? Was it because I had the front end up on the ramps and the dipstick samples the front of the pan?

I pulled the dipstick one more time and noticed it seemed like it might be shorter than my eye-cromiters told me the distance to the oil pan would be. After a brief search of the p/n on the dipstick, turns out the dipstick is not compatible with the CATA motor. It appears to belong to a later model year 3.0l. I'm not quite sure how much shorter it is than the correct one, but it's enough that it doesn't show any oil even when on level ground.

I estimate that there had to have be an additional 4-8 quarts of oil in there. Something close to 3-4 gallons total as I was using a 5-gal drain pan with maybe 1-2 gal in it already. I'm guessing some lube tech just filled it until he saw it correctly on the dipstick and didn't notice that they put in an extra gallon or two. The engine seems to be running just fine, no noticeable change in performance or operation following the completed oil change.

So my question is this: What areas and systems would be damaged by the overfill? I figure it could foul some of the emissions system, but beyond that I'm not sure what else to inspect to catch any failures in advance.
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I estimate that there had to have be an additional 4-8 quarts of oil in there.
No way..... if it had been that overfilled, you should've rolled coal and\or demolished your DPF during the initial drive.
Did you notice any smoke? Smell anything?
Upon initial startup when I first accelerated, I got a little bit of smoke but not a cloud, by any means. But for the rest of the drive home and the weeks after, I haven't noticed any other evidence of burning oil. It was reminiscent of a car that had a very slight valve stem seal leak.

When I picked it up, I read the codes before heading home, I did get some nox sensor errors, but nothing more significant than that. I'm wondering now if that sensor got fouled.
Did the RNS850 display not show that it was overfilled?
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It did not. Do you know if it's a separate sensor that the oil level sender? I can check coding on it when I get home today.
I picked up a 2012 TDI Sport+Nav with 148k miles on the odometer a couple weeks ago and when I picked it up, before driving it 8hrs home, I checked the dipstick and found the oil level right where I wanted it and drove it home.

That was about 1200 mi ago, and I just got around to my first oil change and I noticed that the amount of oil that came out seemed high; it almost overflowed my drain pan. I didn't think too much of it, being new to diesel ownership. Well, I got the rest of the oil change done. put 7.5 quarts of oil in the fill and pulled out a 100% dry dipstick.

I put in another quart thinking I just wasn't quite seeing it yet. Pulled out another bone dry dipstick. At this point I was scratching my head trying to figure out what had happened. Had the new oil not made it's way back into the pan somehow? Was it because I had the front end up on the ramps and the dipstick samples the front of the pan?

I pulled the dipstick one more time and noticed it seemed like it might be shorter than my eye-cromiters told me the distance to the oil pan would be. After a brief search of the p/n on the dipstick, turns out the dipstick is not compatible with the CATA motor. It appears to belong to a later model year 3.0l. I'm not quite sure how much shorter it is than the correct one, but it's enough that it doesn't show any oil even when on level ground.

I estimate that there had to have be an additional 4-8 quarts of oil in there. Something close to 3-4 gallons total as I was using a 5-gal drain pan with maybe 1-2 gal in it already. I'm guessing some lube tech just filled it until he saw it correctly on the dipstick and didn't notice that they put in an extra gallon or two. The engine seems to be running just fine, no noticeable change in performance or operation following the completed oil change.

So my question is this: What areas and systems would be damaged by the overfill? I figure it could foul some of the emissions system, but beyond that I'm not sure what else to inspect to catch any failures in advance.
Trying to understand the thought process here. You know exactly how much the engine takes. You fully drained it. You then proceeded to put 60% more oil than the engine calls for. Right?

Why? If it's not on your floor.. then why?

If you reset the hood properly the end should have detected overfill
I think you misunderstand: this is the first time I've ever changed the oil in this vehicle. When I bought it it had been overfilled to the markings of the (incorrect) dipstick.
It did not. Do you know if it's a separate sensor that the oil level sender? I can check coding on it when I get home today.
Wut? :unsure:
I figure if it's not giving an overfill error, then either it's a separate sensor to detect overfill that might have been bypassed/defeated or the notification/sensor was coded out in the ECM via VCDS.
There's only one sensor and it's in the bottom of the pan...... it's sonic if I recall correctly..... never heard of anyone "coding it out".... it either works or doesn't.... do you see your oil level in the RNS display?
I think you misunderstand: this is the first time I've ever changed the oil in this vehicle. When I bought it it had been overfilled to the markings of the (incorrect) dipstick.
My bad, I get it now. That much overfilled and for that long I'd be shocked if there wasn't main seal or turbo seal damage
do you see your oil level in the RNS display?
I do; it's at the max line after the oil change. I did a quick test to read oil level through vcds and it seemed like the sesor was operational: I started the motor and watched it dip and fluctuate the mm reading.

I'd be shocked if there wasn't main seal or turbo seal damage
I do have some oil coming from the seal between the turbo inlet and that PCV elbow, I just figured it was pooling up at the inlet and getting through the hose boot, but perhaps that bears some investigation!
You need tool T40178 to check correctly.
View attachment 258483
I did a test with the 4.2 dipstick just to make sure there was oil in the sump before I started it. I couldn't find a measurement for it in mm, but after searching that info it looks like it should be something like 102mm!
To ensure proper oil level in your vehicle, please check vehicle's badge to make sure it is not a LandRover
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To ensure proper oil level in your vehicle, please check vehicle's badge to make sure it is not a LandRover
No oil dripping out of it, no oil in it.

Don't want to be scaremongering but check that it isn't fuel dilution.
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Don't want to be scaremongering but check that it isn't fuel dilution.
this was my first thought as well

something doesnt add up here.
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I would suspect that anyone who has sufficient aptitude to do an oil change would notice if what they drained out was 2:1 Oil/Diesel instead of just oil......
I would suspect that anyone who has sufficient aptitude to do an oil change would notice if what they drained out was 2:1 Oil/Diesel instead of just oil......
youd think.... but...
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I would suspect that anyone who has sufficient aptitude to do an oil change would notice if what they drained out was 2:1 Oil/Diesel instead of just oil......
Not if they drained the gearbox by mistake . . . !
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