Common Causes for Oil Loss/Consumption in your Supercharged Audi 3.0T | (B8 S4/S5/SQ5 | C7 A6/A7)

This video should walk you through the most common common issues on the Audi 3.0T that result in either Oil Loss, or Oil Consumption. There are obviously other places oil could leak from, but they are exceedingly rare. Check out the video, and let me know your thoughts.

[gregchapman]

Remove spark plugs. Fill cylinders with GM Top End Cleaner so that the piston is completely covered. Let soak over the weekend. You can turn the engine by hand every so often. The top end cleaner will clean deposits and free up the rings. Suck out remainder and the crank engine with starter while you have rags shoved in plug tubes. Install spark plugs when you're sure the cylinders are empty of fluid. Add LiguiMoly oil flush to engine and run for 20 minutes. Immediately change oil. Has worked for many cars to reduce consumption for me.

[elliottm]

Being new to German-car ownership, having a 2018 A6 for just a few months, I've found your videos to be an excellent source of very useful information for DIYers like myself! Thank you!

[RemyISnow]

I started watching when I had a 2013 3.0T Q5. Then I got a 2016 3.0T A6 after the Q5 was totaled in an accident. I decided I needed an SUV again and got a 2017 3.0T Q7. Q5 took a liter a week. A6 had no oil issues. Q7 needed a liter a few days after I bought it. Hopefully that’s just the dealer using cheap oil or under filling by a bit. Revisiting this video to help diagnose.

[jamalpatrick]

I have the same issue with by 2014 Audi A6, I realize that after checking the oil level virtually, it always seems to deplete a lot faster with normal leisure driving. I had to change my oil like every month and a half to two months depending on how frequently I drive it.

Maybe I will consider changing the type of oil that I’m using. Thanks for your knowledge, and I’m glad to have found the perfect source for knowledge in the Audi community.

[sherlandmoore]

Hey, I have a 2015 audi a6 prestige. I never had any issue with the vehicle until last year with the the oil consumption. Had the pcv change and still was loosing oil. After a few mth took it to audi for the oil consumption test they determined that it was the piston seals ring. A mechanic of mines who deal with these German vehicles alot didnt really see any wrong with my car. He told me to try a thicker oil which made a big difference. The only thing I'm wonder is if when the shop I went to, to do the pcv if they did it properly where you had demonstrated in terms of all what needed to be done. Love the car. Have for 4 yrs now and that's the issue I'm having. The car runs great.

[doodoori]

Nice to meet you!!
I always enjoy watching your videos.

I am driving an A7 3.0T. The accumulated mileage is 140, 000 km.

The engine oil used was Castrol 5W30 LL VW504, 507 standard, and 1 liter was consumed for about 7, 000km.

I am using "Helix Ultra 0w40" because someone said that if you use the 502 standard, you can ride up to 10, 000 km without supplementation. (It is 502 standard in the manufacturer's manual, but 504 standard oil is in circulation due to the launch of new cars)

It seems to be a little better because of its high viscosity, and it consumes less than the 504 standard.

The parts that can be observed from the outside of the engine are the oil filter housing gasket, timing chain cover, rocker arm cover, crankshaft retainer, and oil drain plug gasket.
(Of course, you should also pay attention to the oil lines (oil coolers) exposed to the outside. As time goes by, it is the number one priority for old age.)

In particular, oil filter housing gasket leaks are often misunderstood as they flow to the crankshaft retainer!!!

If it is not observed from the outside of the engine and is consumed, the valve stem seal, piston oil ring, and cylinder wear are most likely as you said.
In case of cylinder wear, it is thought that it is possible to visually check the spark plug with an endoscope by disassembling it.

Above are my thoughts.
It seems that Audi vehicles cannot be free from coolant leaks and oil leaks. :(

[brizax]

Thanks cam
For the videos and support, I’ve tried different grades oils, new pcv, I haven’t tried the oil ring soak yet but have heard good things . Don’t forget to mention hpfp partial or full failure, and running e40

[zac.]

Shell Rotella T6 5w40 is EXCELLENT for these engines + CeraTec. Seen 14k oil change intervals done with this - which I would NOT recommend but it shows!

[carl]

My 2013 c7 avant was burning about 800ml after every 7, 000 mile service. Used castrol edge ll with 130k miles no leaks.

[davidfriedman]

I can’t tell you how much I appreciate your well reasoned and thorough videos here. My 2014 stock A7 has 118k miles and due for service. I will do it myself as usual. I see some oil consumption but only once was it as much as one quart between changes. That’s was probably two or three ago. I replaced PCV and water pump etc about 10k miles ago.

[psychoaquatic]

My stage 1 3.0t a7 which is driven mostly in sport mode just got a low oil warning after 3000 miles since last oil change.

[armourbl]

Our A6 used to get about 7k miles before I had to add a quart of oil, with 10k oil changes. Now it is right at 1 quart every 5k. Will plan on switching oil. Have been using Castrol. Will switch to Moly and add some Lucas stabilizer.

[ProjectArjun]

Don’t forget to check your vacuum pump and oil filter housing gasket

[slowwa]

Awesome video! Can vouch for vast performance valve cover kit, valve covers are easy-ish to remove, the rear bottom torx are not the most fun to get to, have to get creative.

[drozay]

I use pentosin performance ll, been running it for years. Also great oil

[robgarcia]

Yo my dude, your vid made my head spin, packed with valuable C7 knowledge. I have a 2013 A7 and had not had a single issue, absolutely bullet proof. I'm currently at 40k miles, although I'm showing any fault codes, where do I start replacing parts as part of interval maintenance? Great video !

[luckystrike]

17:20 bad / failed exhaust or intake valve stem seals will not show up in a leak down test.

[mikew]

on the pcv test removing the oil filler cap engine running . How much I have some suction making it want to stay on but not difficult to remove the cap. Also when I do that seems to be a metallic sound louder than what I would expect wondering if this is typical ?

[marvinmills]

Great video bro, liked and subscribed.

[ginowild]

10:45 couldn't it be the opposite? We changed the PCV (OE ended with a F) and replaced it (OE ended with H) and it changed from almost no low pressure to a high amout of low pressure. No it's sucking quite hard at the oil cap bit the car feels like having more power than before and it's more responsive. In terms of oil burning i'm not sure at all. Maybe it comes from the piston rings because it's throwing smoke (looks grey to me) when i hit the pedal hard, esp. when shifting and being on the gas straight away. We tried Toralin Anticarbon and we'll see if there's a differencenin the future but i recorgnized the low pressure at the oil cap which makes me wonder.

That breather tube was NOT changed. How can this thing be tested? Maybe that's the issue.