Why my top not closing on my 2009 audi a4 turbo guatto 2.0

SOURCE: Oil for 2007 AUDI A4 2.0t Quatro

The best balance of price, quality, availability that I have found is Mobil1 synthetic - it's on Audi's approved oils list. With the 2.0T engine, you absolutely want to use synthetic (the Audi turbo fours are known for oil sludge issues), and you want to do a SeaFoam treatment every 15k miles or so - that combination will keep your engine in great running shape.

SOURCE: turbo temperature

HI,UNDER EXTREME OPERATING CONDITIONS I HAVE NOTICED THE TURBO TO GLOW RED,SO BETWEEN 800-1500 DEGREES CELCIUS,WOULD SUGGEST YOU LEAVE ENGINE AT IDLE FOR 5 MINS AFTER A HARD DRIVE TO COOL DOWN,ANDY

SOURCE: convertible top will not close /open

I have had this problem with my 2005 S4 Cab - sometimes the top will not latch. I have found that this was because the fabric near the rear passenger window was not folding into place over the steel structure. I just back up the top and made sure the fabric unfolded and all was well.

SOURCE: How do I reset the "service due" light on my 2009 Audi A2 2.0

Press and hold BOTH right and left panel knobs while turning the ignition key to the ON position, the regular ligts come up and cycle. The message 10000 miles till next service should come up meanng the service is reset till next service cycle.

SOURCE: audi a4 mixing water and oil together hissing,grey/brown foam

Just went through the whole process changed the head gasket and still got oil - thanks to guys on the forum that said there is no other way besides the head gasket, went to an audi mechanic and he just laughed, he said 99% of the time it is the oil cooler. He was right.