FWIW, I've run AMSoil in my 2003 WRX since new, and I like it. What actually sold me on it was when I did my first oil change. The used oil still feels new when you run it over your fingers. And the engine still runs just fine.
I'm one of those people that uses Amsoil. I use their European 5w40 and change the oil every 10K or 1 year, whichever occurs first. Never needed to add any oil between changes.
I've had issues with Mobil1 0w-40 oil, even though it "meets the spec", and switching to a different brand resulted in less timing chain and valve train noise, and quieter cold starts, which typically means less wear, so I switched.
If it's a stock engine use 5-30. I use Mobil 1 full synthetic 5-30 in my b18c and it's been good for thousands of miles.
I don't see any 0W-16s available from the usual suspects but found a mention of a Mobil Super 0W-16 on mobil.jp.
Personally, I would buy Mobil 1 5w-40 Turbo Diesel Truck. Not the VW spec oil. The Mobil oil has much higher amounts of zinc which helps reduce the cam wear inherit to that engine. I have been using it in my BRM and just checked my cam the other day with 70k miles on it and it looks perfect.
If I do the oil change, I only use Mobile 1 0W-40 Synthetic European Formula. I get them at Walmart for $25.50 for 5 quarts. For oil filter, I usually buy it from the VW dealer.
Here is what I've been using on the Gen3 1.8t (2014 passat) - http://www.amsoil.com/shop/by-produ...otor-oil/european/european-car-formula-5w-40-synthetic-motor-oil/?code=aflqt-ea . Works really well with a 5K OCI.
Mobil 1 of varying weights for all of my cars. Been using it for years and it's served me well.
I use Mobil1 0W-40 on my 1.8T with 150,000 miles and engine is definitely quieter after oil change.
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