Whatever weight the owner's manual says it takes, I'd use that. You'll definitely want to go with a high quality oil though. I personally use Liqui-moly... I have 192,000 on my 2012 A6, and she's still purring right along, a lot of which in my opinion has to do with the higher end oil.
Reviews of LIQUI MOLY parts For Business
Germany
Liquimoly 5W-40, every 7k kms or 6 months. I buy it myself and get it done by any garage
Liqui Moly 5w-40 every 7k. Do it myself in my driveway ????
I order the right price point of liquimoly because it burns less vs other brands, in my experience
Honda OEM filter (Honda used Tokyo Roki oil filters for my bike ????) I used to buy Motul 7100 4T, however the price on that recently SKYROCKETED… it’s almost 80$cad before taxes for 4L (60$ for 1.05669Gal for you freedom folks).I refuse to pay that much for oil, so I now I buy Liqui-Moly Street 4T. And that’s basically the same price that the Motul USED to cost. 50$ (35 eagles, or whatever) I am aware that Motul 7100 has esters added to it, which Liqui-Moly Street does not, and that technically Motul 7100 is a better oil. But it’s not double the price better… I was willing to pay 60$cad, but not 80$cad lol.If I can find Bel-Ray EXP (another ester blend) at the shop, I’ll buy that too :P but Liqui-Moly seems to be much easier to find.
Liqui Moly TopTec 4100 is good and cheap. Castrol oil is, indeed, not worth the money.
I currently use Liqui Moly 5w-40 in my 02 WRX and it loves it.
I like this oil, I believe it was Castrol Syntec from the factory (says so on the oil cap) but it became slightly hard to find and the Liqui Moly has been great oil so whatever. I changed my oil last year at about 9500mi and it didn't even get dark until about 7k miles.
My B9.5 S5 went through a quart about 3000 miles into the last oil change. This oil change that im on now I havent had the light come on and im at about 5000 miles which is when I change oil. I started taking mine to an Indie shop and they use Liqui Moly oil plus they add this little bottle of addative thats supposed to help lubricate the piston rings better.
Liqui Moly Leichtlauf (the dark blue bottle) 5w40: This is the oil I ran this sumer, and I'm on my second oil change with it. This oil burned about 2 quarts during both intervals, but did not seem to thin out or break down at all.
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