Engine oil Mobil or OEM Volkswagen

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.

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.

Mobil 1 5W-30 and a matching oil filter. '93 244 with 311,000 miles.

Back when my motor was relatively stock, I ran Mobil 1 - 15W-50 and had no oil consumption/burning. This was back when Mobil 1 15W-50 was a true synthetic not just a group III base stock. The motor has 80k on it when I switched it out (don't remember what the PO ran... I doubt they did either) and ran another 40k through it with that oil.

VW recommend full synthetic 5W-30 or 5W-40. Some owners also use 0W-40 as well, it's easier to find on store shelves. Honestly using the right type of oil and changing it regularly is more important than the brand. Just don't buy the cheap store-brand recycled stuff and you'll be fine. People go back and forth online about brands and stuff but you're probably talking about fractions of a percent better one way or the other. If you still want suggestions: Mobil-1 oil and a Mann filter, there, I said it.

I'm currently happy with Mobil 1, 15w50, except when it comes time to pay for it, yikes that stuff is pricey. First time I ran the Mobil 1, guess what happened?? Oil light flicker at hot idle. Replaced the low pressure switch, no more flicker. That switch didn't change characteristics just because I changed oil, the fresh oil was thinner, oil pressure decreased.