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.
I run Motul 800 at the Motul recommended mix of 50:1. I use a JD jetting kit and my bike never spooges as long as I never let it sit and idle.
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.
Mobil 1 of varying weights for all of my cars. Been using it for years and it's served me well.
Motul Xcess full synthetic
I use Mobil1 0W-40 on my 1.8T with 150,000 miles and engine is definitely quieter after oil change.
Mobil 1 5W-30 and a matching oil filter. '93 244 with 311,000 miles.
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