You will always need some additive, because the underground storage tanks aren't always clean. There is a fuel return line in our vehicles and returned fuel is heated up and will cause the water condensation in the fuel system and settling in the fuel tank. For the petrol engines I recommend and use Interject 415R and BG 44K. I get the best feedback from BG 244J diesel additive, but be ready to pay double for it compared to VW diesel additive.
Maybe VW should also look onto the ridiculous long service intervals for the fuel filters. There is an option to change the fuel filter more often for the countries that don't meet the EU fuel standard, but in AU they fobbed it of saying that the fuel here meets the EU standard, but the reality could be different. Then the car owners are left to fight the fuel suppliers, because the warranty doesn't cover the contaminated fuel, and the fuel company are saying that our fuel is perfect.
It's so perfect that many carmakers until the recent time didn't bring their modern (CR) diesels into AU. Except, MB, VW and Peugeot.
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