Hey dude, I just emptied out my turbo light 4100 motul after 2,500ks and put in 10/40 300v. Awesome oil, unfortunately becauase of my oil coolers and re-postitioned oil filter + lines I used over 5liters so I had to buy 6 litres of it. Cost about $140. However I have noticed already how big a difference the 300v makes, beautiful oil - could not be happier. I might have used royal purple but after driving with 300v, I dont think I could use anything else. I was going to use Fuchs oil but for the right spec it was going to cost $300....and thats on my company account and we purchase 20 thousand dollars worth of their oil every week.