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continued from part 1: http://www.myturbodiesel.com/1000q/q7/2010-2011-audi-q7-tdi-forum-faq.htm

Using biodiesel in your Audi Q7 TDI The 3.0L TDI CATA engine will run on biodiesel but VW/Audi's official limit has always been a maximum of 5% biodiesel (B5). Past TDI ran very well on high percent biodiesel but there hasn't been wide scale long term real world evaluations yet with this exact engine. The concern vs. older TDI engines is the new emissions system and engine oil dilution. The exhaust traps particulates in a diesel particulate filter (DPF) and burns them out in a self clean cycle (post combustion injection). During a post combustion injection cycle, the engine injects a little extra fuel after the engine combustion cycle. Because biodiesel has a higher flash point, a higher percentage of this post combustion fuel will end up in the engine oil instead of vaporizing and oxidizing to heat up the filter in a self clean cycle. Biodiesel also evaporates slower so it will accumulate much faster and greater than regular petrol diesel. A little biodiesel can be easily tolerated but the long term effects aren't known on the new common rail TDI engines. Poor quality biodiesel could also shorten the life of the DPF filter. For more basic information about biodiesel and VW, see 1000q: intro to biodiesel. For details of the emissions system, read 1000q: DPF filter and Adblue fluid FAQ.

Power upgrades like an Audi Q7 TDI chip
Upsolute makes a power chip for the VW Touareg TDI and it should work on the Audi Q7 since they used the same engine. It may be slightly different due to emissions tuning but I'm not sure about that.

Tax credits and sales tax exemptions with the Audi Q7 TDI
There are no tax credits anymore. Please refer to the tax credit article through the FAQ for reference to the expired credits.


Video reviews of the Audi Q7 TDI

http://www.youtube.com/watch?v=oRCQ2FXIsdY
http://www.youtube.com/watch?v=2V4Bzb4MI44
http://www.youtube.com/watch?v=4IiuXuf23n4

Delivery inspection
When you take delivery of your Audi Q7 TDI, don't let the happiness overtake the inspection. Don't let the salesman rush you out the door because you paid tens of thousands of dollars for this car. They can wait. There is inconsistency in how different dealers prep their cars since dealers are all independently owned and operated.

Carefully inspect every panel gap for even spacing. If cars are damaged at the factory or during transport, they can repair/repaint the panel and still sell it without disclosure of the damage because it was repaired. Uneven paint surfaces that have a rippled orange peel like reflection over a single panel but not others is often an indicator of a low quality repaint. Look at the bottom edges of the car for damage that may have been overlooked during the dealer prep.

The paint should be free to swirl marks or halos. If there are swirl marks on a brand new car it means the dealer's detailer used dirty or harsh tools and put fine microscratches into the paint. These are worst on black cars. A strong light should reveal these. For these reasons, never take delivery of your car at night or when it's raining. If there are bumps in the paint, it means some contaminants were sealed in the paint under the wax. This is a common problem for cars transported over long distances because the train rail dust and dirt from the truck can get stuck in the paint. A claybar treatment will pull them out. See 1000q: claybar treatment for more details. The reason dealers don't do it is because sloppy or dirty claybar treatments can put scratches into the paint.Some cars have had spots or defects in the clearcoat. If a hairdryer makes it disappear it's moisture trapped in the clearcoat. Sometimes it goes away and sometimes it causes flaking.

Inspect the paint for any paint defects like light spots in the clearcoat.

VW quirks/features and other misc stuff to know after taking delivery
Don't put gasoline in the car! Common misfueling situations are: someone borrows the car and fills it up with gas as a favor. The car runs out of fuel and roadside assistance brings gas. The car goes to the dealer and the lot attendant puts gasoline in it. If someone does put gas in your TDI, stop as soon as practical and safe and tow it to a mechanic! The car probably won't get very far but don't risk getting into an accident by pulling over suddenly!

Expect fuel economy to increase after engine break in by 10-15%. It's particularly noticeable because the greater the fuel economy, the more mpg you get as a percentage of break in. In general, car salespeople don't know much about cars other than what's in the sales brochure so I wouldn't take mechanical advice from them. See 1000q: engine break in for some advice in addition to the instructions in the owner's manual.

Any diesel engine could have a "runaway diesel engine". This is an unusual malfunction caused by an engine eating its own engine oil. This is possible because diesel engines are throttled by fuel and can run off almost anything that will burn if the conditions are right. This is why it's possible (but not recommended) for the car to run off vegetable oil. These veggie car conversions are called greasers. If the car is in gear it will also accelerate. If the engine ever races on its own, keep control of the car and shut off the engine as soon as it's safe and practical. Take it to a mechanic before starting it again. Read more about a diesel engine runaway and some causes at 1000q: runaway engine FAQ.

The turbo wastegate is fully electronically controlled instead of electro-pnuematic (solenoid) like on older TDI.

A common complaint on German cars in general is a fast speedometer. German law doesn't allow for slow speedometers even after equipment variations like different wheel and tire sizes. The odometer reading should be correct for warranty and maintenance purposes. The mpg meter is based off that so it should be fairly accurate. However, the best way to calculate fuel economy is by filling the tank all the way at the same pump each time, and dividing the amount of fuel pumped to the miles traveled.

If you need to replace your Audi smart key fob, you must buy a new one because of the immobilizer. This applies to both keyless entry or keyless access (w/start button) systems. The immobilizer chip is completely separate from the remote fob on keyless entry. If the immo chip isn't programmed correctly, the engine will shut off 1 second after starting it. See 1000q: immobilizer FAQ for more details.

If you unlock the car using the remote and don't open the driver's side door within 30 seconds, the car will relock. This is to prevent accidental unlocking. If the car doesn't seem to know that the driver's side door was opened, the microswitch in the door handle module is bad.

Your Audi Q7 TDI must only use VW-Audi spec 507.00 engine oil for warranty purposes and to maximize the DPF filter. DO NOT trust the dealer to comply with this requirement, even under their 3 years/36,000 mile free maintenance program! Dealer techs are busy and sometimes they don't know any better. It could just be a matter of which bottle is closer. Always check which oil will be used on your car with the exact mechanic who is changing the oil. Also check the receipt for the part number.507 spec engine oil is important because it's very low ash. The more ash in the engine oil, the faster the DPF exhaust particulate filter will clog with ash, requiring removal and cleaning of it. See 1000q: DPF FAQ for more on this system. Some oils that meet this spec are Castrol SLX Professional LL03, Motul specific VW 507.00, Total Quartz Ineo 5w30 507.00, and Mobil 1 ESP Formula 5W-30.

The part numbers for 507.00 oil are:
VW# g v52 195 a1 (g v52 195 a1) for .5 liter
VW# gvw 052 195 m2 (gvw 052 195 m2) for 1 liter
VW# gvw 052 195 m4 (gvw 052 195 m4)for 5 liters
Here is the TSB in .pdf format which lists engine oils approved by Audi - click to view it (scroll down to the bottom for 507.00 oils) https://www.myturbodiesel.com/d2/images/pdf/vwoiltsb.pdf

Never use any coolant other than OEM VW G12 or G12 compatible coolants in the antifreeze system! This includes green Prestone. It will cause sludging and turn brown. The coolant system is sealed so if it's low, figure out where it's leaking.

If the front wipers are on, the rear wiper will activate when you go into reverse. The cabin vent will also go into recirculate so that you don't breathe any exhaust.

Always use the parking brake when parking! It's good practice with any car but it is important on Audi because this sets the rear caliper self adjusters. It's best to apply the p-brake before shifting into park so that the stress is put on the parking brake instead of the parking pawl in the transmission.

To change the windshield wipers, press the stalk after shutting the car off. They will move up so they can be changed.

All plastic headlight lenses will become weathered and pitted over time. UV-resistant headlight covers or protectors will keep your headlights looking like new. After the covers age, they can be removed and replaced. Paint protection film over the front hood and fenders can also help prevent rock chips but it also costs a lot more than simple headlight covers. Paint protection film also reduces the shininess of the paint and will leave a line where it ends but it's not noticeable unless you're looking closely. It can also be removed without any damage to original paint. Paint film should never be used on repainted panels since it can pull off the paint.

The diversity radio antenna is in the window glass. Be careful if you apply window tint because certain brands/models of tint contain metal particles (metallized or sputtered metal) which can interfere with FM reception. Many modern hybrid metallized tints won't hurt FM reception much but they will still reduce AM reception quite a bit. The windows already have tint anyways.

The instrument cluster is covered in an anti glare coating. Use a soft cloth (preferably microfiber) and water to clean it. Never use paper towels!

All emissions equipment is covered under warranty under federal emissions laws. Do not tamper with any federal emissions equipment. Due to the engine management system, there is no way to disable the DPF or bypass the DPF on an Audi Q7 TDI. If you remove the DPF filter, it will set off a check engine light. It's possible that it can be disabled but your car would no longer be in compliance with emissions. See 1000q: DPF and Adblue system FAQ for more details on the "clean diesel" system. Never add water to the Adblue system since it will cause damage!

Make sure the dealer tops off the Adblue tank before delivery! It is not topped off at the factory and you will quickly run out if they neglected this item on their delivery checklist.

Do not add aftermarket rustproofing since it will void the factory rust warranty. VW are dipped in anti-rust zinc coatings and have a few layers of paint to prevent rust. While it could still happen and the rust warranty only covers certain kinds of rust, the best thing to do is to wash your car regularly, including the undercarriage. See 1000q: car detailing index for tips on how to avoid scratches and swirl marks from car washing. The best thing to do is to avoid automatic car washes unless they are "touchless".
 

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A bunch of pics added to help describe some of the options and whatnot.

Also added some detailed information on the 2009-2010 cosmetic refresh with examples of the s-line bumper and standard bumper. I think it's ridiculous that Audi's website lists a $2000 s-line option package without an example of what you're getting.
 
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