I agree with ainarssems. Don't worry about it until its an issue. When it is an issue, go down the brute force root. Make sure you use a 6 sided plug spanner for maximum grip and a long breaker bar to exert torque slowly. If it snaps, get that cylinder to top dead centre on the compression Stroke (valves both closed) And get a piece of wood dowel the same size as the plug housing and drill a 4mm hole to start with in it with a pillar drill. You now have you drill guide. Measure the amount of plug left in the hole, mark you drill bit so you don't drill to far ( preferably not as far as the electrode) and steadily increase the size of the bit until about 10mm, then try a stud extractor. If that fails, continue drilling until you drill out the plug and the heli coil blow out any swarfe, vacume out the swarf, then blow out the swarfe and reasemble.
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Conan (the Librarian)
Watch it if you dare
Currently,
2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.
Previously
2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light. 
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