I've had good luck with Castrol for several years in two WRXs.
If your interval is 30,000km / 20k mi (2Y) then you should use the higher spec VW 503 / 504 (left page) if you have the 15,000km / 10k mi (1Y) interval then you can use the lower grade VW 501 / 502 oil on the right page.
I always use Castrol, good quality oil won't hurt the engine and is just slightly more expensive than off-brands.
any oil that meets the LL-01 standard will do, buy whatever is on sale. Castrol Edge Euro 5w30 is fine, Mobil 1 euro synthetic, whatever.
My conclusion was to use the best Castrol in the gold bottle. Of course, YOU must use the specification of weight recommended by the owners manual for the temperature range you expect to be operating in.
The gallon of Castrol is the same whether you buy it at CT or Napa.
Personally I always run Castrol and it's done me well, even in older cars that had been a bit battered.
Been using the molygen one, noticed a small reduction of oil consumption and better idling than Castrol (VW recommended)
I ran Castrol 5W30 full synthetic in the engine.It burned a quart every 3500-4000.
I noticed when the castrol 508 spec wears. It smells Faintly of onions and beans. Strange smell indeed, when I took my car to street side VW out of Amarillo, Texas.
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