Petrol in a Diesel Audi Q5? Start With the Tank
If you have put petrol in a diesel Audi Q5, the capacity of its tank is among the earliest points worth knowing, as it settles how much of what is in there is currently petrol. Every version of the Audi Q5 we have data for is set out on this page alongside its tank capacity, and so are the engines it was sold with.
The guidance doesn't vary with the figure once it has occurred. With the motor kept off, phone Petrol in Diesel and the vehicle will be emptied where it stands.
Audi Q5 fuel tank capacity, version by version
75 litres is what the diesel tank holds on every version of the Audi Q5 we have figures for, as they all use the same tank.
| Version | Fuel tank |
|---|---|
| Audi Q5 2.0 TDI quattro | 75 litres |
| Audi Q5 3.0 TDI quattro | 75 litres |
What a couple of litres amounts to for wrong fuel in your Audi Q5
The share of petrol depends on how full the tank was before you refuelled. That is because wrong fuel in your Audi Q5 mixes with whatever diesel was already in it. Up to 75 litres fit into your tank. Filling an almost full one with a few litres of unleaded means only a minor share of petrol in the whole, while the same quantity in a nearly empty tank is far more of what your engine would take in.
People commonly ask how much petrol is too much. The more useful thing to check is whether the engine has been run, because starting it is what takes the mixture from the tank and through your pump and the fuel injectors.
Having it drained is the safe option no matter what the proportion is. When the volume is small, your Q5 normally needs nothing more than that.
The engines in the diesel Q5
Before you ring, it is worth checking the version name on the badge, as it shows us which motor your Q5 has.
The badges on all diesel versions of the Q5 within our data are TDI.
The Q5 3.0 TDI quattro carries the largest motor at 3.0 litres, and the Q5 2.0 TDI quattro the smallest one at 2.0 litres.
The figures also take in Quattro versions of the Q5.
If you are not sure which version you have, call all the same and we will work it out with you.
AdBlue in a diesel Audi Q5
Fuel tank size works differently with AdBlue. If you have got AdBlue in a diesel Audi Q5, the diesel surrounding it does not weaken it, because AdBlue is largely water and doesn't mix with diesel. It settles to the bottom of your tank, which is where the fuel pump draws from, so even a small quantity reaches your fuel lines.
AdBlue gives the pump no protection and will not combust. Its water dries out as it sits, leaving urea that forms crystals in the filter and your lines, where it attacks the metalwork it sits against.
Some diesel cars hold AdBlue in a separate tank with a dedicated filler, often alongside the diesel one under the same fuel flap. If your Q5 has an AdBlue filler, the AdBlue filler cap is usually blue and accepts a smaller nozzle than the diesel one.
What a fuel drain on your Audi Q5 involves
Whatever size your tank is on your version, a fuel drain on your Audi Q5 clears the lot, just where the vehicle is parked. Drawing out the tainted fuel comes first, then a rinse of the lines and your fuel filter. Then we refill with fresh diesel, prime your system and start the motor.
Whether your Q5 is still at the station forecourt or left on your drive doesn't change anything. You can drive it away when the drain is finished, and it will be running on clean diesel.
AdBlue removal from a diesel Audi Q5
With AdBlue sitting at the bottom of the tank and not mixed in, AdBlue removal from a diesel Audi Q5 starts by draining the tank fully. Where the engine has been started, we flush the fuel lines and the filter through as well and change the fuel filter if it needs it.
What this covers is AdBlue that ended up in the diesel tank, not taking out or switching off the AdBlue system on the car.
How the quote of a fuel drain on the Audi Q5 is worked out
Two jobs on the same model can be quite different, so we do not list a fixed price. How much was put in compared with the size of the tank, petrol or AdBlue, and where the car is now all matter, but whether the Q5 has been driven or just started changes it most.
We can tell you what is involved in this job once you ring with those details.
Tank queries about petrol in a diesel Audi Q5
How many litres is the Audi Q5 fuel tank capacity?
It takes 75 litres, and every version we have data for shares that tank.
With a larger tank, is petrol less of an issue?
That petrol is still there in a larger tank, and still gets to your pump when the motor runs, even though a few litres make up less of the whole. All of that comes out with a drain, as long as your Q5 is turned off.
How many versions of your diesel Q5 are in your figures?
Our data cover 2 diesel versions of the Q5, all set out in the table above, and so you can pick out yours there by the name shown on its badge.
Wrong fuel in my Audi Q5: what does that cover?
Petrol counts whatever the grade, super unleaded too, and so does AdBlue that was meant for its own separate tank. Anything other than diesel in the diesel tank is wrong fuel.
Do you come to the Audi Q5 to drain it?
We do. Your car doesn't need to be moved or started, since we come to it whether it is still at the station forecourt or left at home.