Hi guys what is the best alternitave for a powershift gearbox s40 2009 model the
Liqui-moly Dual Clutch Transmission Oil 8100 1 Litre or vw dsg oil?

 

best is any synthetic that meets Volvo factory specs. Dunno about the Volvo, but my VW DSG requires an oil change with filter every 40K and I've been using VW OEM. If I had a Volvo dual clutch, I'd probably go with OEM as well. Check out FCP, IPD and dealer stores like Tasca Parts to get the part number then you can shop any site. You can probably find the factory specs in the Owners Manual. If you really want to research this, check out the bobistheoilguy.com blog.