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Fuels & Lubricants Discussion all about Fuels & Lubricants. synthetic oil, conventional oil, brands, change intervals, diesel grades, gelling and such debated items like that. Non TDI related postings will be moved or removed. This forum is NOT for the discussion of biodiesel and other alternative fuels.

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Old November 16th, 2017, 17:32   #1
Tdi2015
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Default Burning Oil 2015 TDI

I've been burning a quart or oil every 5k miles. I did not burn oil for the first 20k or so. I bring it to the dealer for maintenance, and they are using the 507 spec. I am also, though less frequently, running low on coolant. The car has 75k on it(mostly highway)and I've been thinking of switching to 5w-40 low ash, that's used on MB. But I guess my questions are, should I be concerned that she's burning oil at that rate? Is it a good idea to switch to a non 507 oil, that is low ash? Would any of this impair my ability to participate in the buy back? Would changing oils stop it from burning oil?
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Old November 16th, 2017, 17:44   #2
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I'd be more concerned about the coolant loss. Is there any sign of coolant or oil leaks? They won't care(or know)what oil is in the sump when you take it in for the buyback.
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Old November 16th, 2017, 17:46   #3
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No sign of leaks, which at that rate I was surprised. I figured there'd be something in the driveway or my parking spot at work. Do you think they're related?
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Old November 21st, 2017, 13:03   #4
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I'd take a used oil sample and have it analyzed ASAP. The two effects could very well be related if coolant is being burned and/or getting into the oil itself. It could also be possible that a quart every 5000 miles is normal for this particular engine when driven hard.
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Old November 21st, 2017, 16:09   #5
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OP: clarify exactly what you mean by "running low on coolant."

Sadly, 1 qt every 5k miles is probably considered within "normal" range for any ICE, so you might not really have a significant issue.
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Old November 21st, 2017, 23:55   #6
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2015 Passat TDI, Similar mileage, 90 percent highway miles
Also burning around the same amount of oil. I'm low about a quart at 7500 miles when I do my oil change. No coolant loss for me.
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Old November 22nd, 2017, 05:50   #7
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This might just be par for the course for the new engine. We'll have to get more data points from owners to decide if this is a trend or not.

This would be odd for the VAG diesels though, as unlike their gasoline fueled stablemates, rarely have much of an oil appetite.

I would advise to minimize any variables in your checking/adding/measuring regimen by doing things the same way each and every time, and letting the car sit for a bit after it was warm before checking the oil, and only adding the absolute minimum necessary to bring it to the full level if it is found to be below.
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Old November 22nd, 2017, 08:36   #8
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I had that problem, when I had to much oil in the tank. The thing is I had as much oil as prodeuce rsuggested. I simply stoped adding so much
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Old November 22nd, 2017, 10:46   #9
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Is this a NOS bought this year (most likely not with 20K on the clock) or one owned since 2015?
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Old December 29th, 2017, 07:52   #10
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I bought it brand new. I switched to a 504 spec oil, have put on 6k and have had the oil light come on yet. As far as being low on coolant, I mean low enough for the coolant light to come on, and the coolant level to be below min. line. The strange part is that I didnt burn for the first 20k or so miles. Then I began burning it regularly. I figured that, I put on 50 miles every time I drive and drive about 80mph, all high way. So I was wondering if that was just too much for the 507 to take. I dont understand why I would be going through coolant though without a leak. It's a closed system is it not?
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Old December 29th, 2017, 18:16   #11
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I think you have a problem especially that your coolant loss coincided with more oil consumption. I'd have the cooling system pressure tested and as suggested have the oil analyzed.

I just developed an oil leak in my 2013 but have isolated it to the turbo return oil line. It shows up on the garage floor.
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Old December 29th, 2017, 23:07   #12
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I drove my 2014 pretty aggressively once warmed up, still haven't added a drop between 16k changes. However I did notice that dealer gave me the cheaper 2009+ tdi oil last time which is still 507 rated rather than more expensive stuff it usually gets. Level dropped a bit more and oil analysis came back with higher wear than other oil.

I had a phantom coolant leak that I could never find even after looking over entire engine bay and cabin. Coolant went below minimum one day, topped back up and hasn't moved since. Very strange
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Old December 30th, 2017, 05:47   #13
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TDI2015 and Dannyboy:

Please clarify how much coolant you're adding. I've found, with 2 2009 TDIs, a 2012 and 2014, that ALL of them required adding some coolant between 20k and 50k. I assumed it was simply the expansion of coolant hoses, but I may be way off.

So, how MUCH coolant are you losing?
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Old December 30th, 2017, 06:36   #14
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Ive put in about half a quart of coolant. Hasnt moved since. Almost seems like system burped final air pocket but after 40k and nearly 2 years.Highly doubt it. It was very slow level drop at the start, then a quick drop, now nothing. I do smell it a bit from the front if left idling but cant find anything.
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Old December 30th, 2017, 10:13   #15
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In both of your situations I would check the coolant cap or just replace it with new.
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