Not sure on the spark plug change interval, I do every 50,000 miles.
Only use oil that meets the VW 502 spec, like Mobil-1 "European Formula 0W-40", available at Walmart for $27 for 5 quarts. This engines uses 4.8 quarts to refill. Always use a OEM (Mann, or Hengst) oil filter. Change your oil and filter every 5000miles.
Change the transmission fluid and filter every 40,000 miles, there are some wear issues with the aluminum valve body bores. Make sure you use the correct ATF for this Aisin made transmission, not some "Universal Multi-Application ATF". The Ravenol T-IV synthetic ATF is especially formulated for this transmission. There are two similar pan gaskets and filters for the two similar versions of this transmission, the Q3 needs the "09M" 9 bolt gasket version, not the 8 bolt. I used a 2 gallon garden pump-sprayer (about $10 at Walmart) to fill, easy, no mess. Just fill the pump bottle with 6 quarts of ATF fluid, cut off the tip of the spray wand, then push the fill tubing onto the wand. Pump the sprayer handle about 5 to 7 times, and then the wand trigger valve allows easy on-off control of the fluid into the transmission pan. The fill tubing came with a plastic screw-in fill adapter (screws into the pan fill hole), from BlauParts. The gasket and filter that came with the Blauparts kit was Meyle part number 1001370005 or MHK0044 . You need VAGCOM or equiv tool to be able to read the transmission fluid temperature, to properly set the fill amount.
Also change the Bevel Box gear oil (bolted to the automatic trans, the thing where the rear driveshaft connects), and the rear differential gear oil every 40,000 to 50,000 miles. These use a GL-5 75W90 gear oil G052145S2. (double check the oil part number). I used a another (clean) pump-sprayer bottle for the gear oil. (you don't want to mix the different fluids)
Change the Haldex fluid (the other part of the rear differential unit), and clean the filter screen on the pump every 30,000 miles. Haldex oil G060175A2. A Gen-4 Haldex has replaceable cylindrical filter, the Gen-5 does not. (Not sure when VW/Audi switched from a Gen-4 to a Gen-5). My 2015 Q3 has the Gen-5 Haldex unit. Use a third, clean, pump-spray bottle for the Haldex oil.
Also, proactively replace the PCV/Pressure Regulator unit, to prevent rear main seal damage if the PCV unit fails. The PCV unit is about $145.....and takes about 15 minutes to replace......just make sure you buy the latest part number revision, as VW has improved this part numerous times....non-VW parts vendors sometimes sell the older versions of the part for less money...buy it from a VW/Audi dealer to make sure you get the latest. Also, only buy the OEM part, made by Hengst. There are many cheaper knock-off / aftermarket brands out there......
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