PL: Oil consumption - should I be worried?
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PL: Oil consumption - should I be worried?
Hello to you all!
I have a thought that is bugging me recently... I bought a 2016 Q5 with CNCE 2.0TFSI engine. I decided to buy it knowing its a gen 3B engine, that should be safe from this whole oil doom. But recently some Youtube clips made me thinking if I did the right thing. I am asking cause some of those clips say gen 3 & 3B are safe, some say, that Audi corrected the pistons in 2013, but rings themselves were corrected in 2016-2017, thus even a 2016 engine wont be safe... My Q5 has 89.5k km, book says oil was replaced every 15k km. When I bought it, I replaced oil and filled it to exactly middle level between min and max on MMI. After ~200km I made with it, MMI dropped 1 notch down, what got me thinking... Nevertheless, this oil is only to clean crankcase a little and will be replaced after another 100-200km with an addition of some cleaning agent. After the replacement I plan to change oil every 9-10k km.
What do you folks think? Should I be worried or CNCE is already safe from oil consumption and I should look into a PCV?
I have a thought that is bugging me recently... I bought a 2016 Q5 with CNCE 2.0TFSI engine. I decided to buy it knowing its a gen 3B engine, that should be safe from this whole oil doom. But recently some Youtube clips made me thinking if I did the right thing. I am asking cause some of those clips say gen 3 & 3B are safe, some say, that Audi corrected the pistons in 2013, but rings themselves were corrected in 2016-2017, thus even a 2016 engine wont be safe... My Q5 has 89.5k km, book says oil was replaced every 15k km. When I bought it, I replaced oil and filled it to exactly middle level between min and max on MMI. After ~200km I made with it, MMI dropped 1 notch down, what got me thinking... Nevertheless, this oil is only to clean crankcase a little and will be replaced after another 100-200km with an addition of some cleaning agent. After the replacement I plan to change oil every 9-10k km.
What do you folks think? Should I be worried or CNCE is already safe from oil consumption and I should look into a PCV?
AudiWorld Senior Member
Joined: Feb 2018
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From: Canada
15,000KM oil changes are initiated by governments trying to globally reduce oil usage. Vehicle manufacturers comply in the owner manual OCI’s because the vehicle will achieve end of warranty and afterwards the sludged engines are not their problem. I change my oil every 5,000KM - 6,000KM and my engines produce no sludge and burn zero oil. Could I go a bit further between OCI’s… most likely… but I am in a harsh climate and quality oil changes are inexpensive long term insurance.
I replace PCV’s every 100,000KM as preventative maintenance.
I replace PCV’s every 100,000KM as preventative maintenance.
Last edited by AudiAllTheWay; Sep 2, 2024 at 04:50 PM.
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But shouldn't 4 intake injectors take care of carbon buildup there? I mean yeah I agree with carbon buildup if you only have 4 direct injectors, but having 4 more that are in the intake should help a lot with intake cleaning itself under higher stress conditions, shouldn't it...
AudiWorld Senior Member
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From: 2014 Q5 2.0T
You are confusing carbon build up on the top of the intake valves exacerbated from direct injection with carbon buildup on the piston rings. The two have almost nothing to do with each other.
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As for carbon buildup on piston rings, I know I want to use some kind of engine flush or rinsing agent with the next oil change, to try and get rid of as many stuff from inside the crankcase nad pistons/rings as possible. Also any tips on how I can clean it without taking whole engine apart to get to rings are greatly appreciated. Just bear in mind, that if you mention any specific cleaner from outside of Europe, I might not be able to aquire it...
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From: Georgia
CNC is a Gen3, not 3B engine. The 3Bs are in the B9s. No idea if Gen3 tend to develop oil ring issues; it's not relevant to any US/Canada longitudinal B8. So we simply don't see any reasonable cross section of that engine population here. They were used in VW vehicles in the mid 2010s here. If you're on the fixed interval config, it's every 15k km. But you would be doing yourself a favor with more frequent changes. At least every 10k km, if not 7500 km. What is "one notch"? There's no notches on the display bar in my MY09. Audi spec is no more than 1L per 2k km. So until you've put in at least 1k km, probably hard to say if the movement means anything. The level will go up and down a bit with long trips and such. What you care about is the average movement over the course of thousands of kms.
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What I meant, graphically the bar between min and max on MMI is divided into 8 blocks/bricks/notches/etc... When I filled my engine with oil, MMI was showing 4 blocks (middle between min and max), after those 200ish km it only showed 3 blocks, meaning a little bit lower than middle state.
Concerning other matter I am used to change oil every 10k km, 7500km seems a little bit extreme from my perspective... But on the other hand I am only used to VW's undestructible 1.9TDI... Honestly I have never driven gasoline engines, only diesel is present in my life so far.
BTW. Do you by any chance know what is the volume difference between min and max levels on MMI?
Concerning other matter I am used to change oil every 10k km, 7500km seems a little bit extreme from my perspective... But on the other hand I am only used to VW's undestructible 1.9TDI... Honestly I have never driven gasoline engines, only diesel is present in my life so far.
BTW. Do you by any chance know what is the volume difference between min and max levels on MMI?
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From: Georgia
The idea of the bar is that the top is full and the bottom is min, the range of which is expected to be around "1L". But the yellow "I'm down 1L" dash warning doesn't come on for me until the bar has been empty for a bit. So if it has 8 "units" on yours, probably closer to 100mL each.
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From: 2014 Q5 2.0T
I disagree. My words about 4 indirect injectors helping to keep the intake clean were referring to:
As for carbon buildup on piston rings, I know I want to use some kind of engine flush or rinsing agent with the next oil change, to try and get rid of as many stuff from inside the crankcase nad pistons/rings as possible. Also any tips on how I can clean it without taking whole engine apart to get to rings are greatly appreciated. Just bear in mind, that if you mention any specific cleaner from outside of Europe, I might not be able to aquire it...
As for carbon buildup on piston rings, I know I want to use some kind of engine flush or rinsing agent with the next oil change, to try and get rid of as many stuff from inside the crankcase nad pistons/rings as possible. Also any tips on how I can clean it without taking whole engine apart to get to rings are greatly appreciated. Just bear in mind, that if you mention any specific cleaner from outside of Europe, I might not be able to aquire it...
For the piston rings I am experimenting with a restore oil but I don't know if you can get it in Europe. I would not worry about it at this point if your oil consumption isn't that high. Most engine flush products won't have much effect on this engine. No need to worry in my opinion unless your consumption accelerates to very high usage. I have 135K+ miles on my 2014. Short oil changes will for sure help though, use an extractor which takes less than 15 mins.