Shure the turbo is leaking?
Maby it´s just the seal from the "oil drain line"?
Did the problem just ocur with the 5W-40?
I like the 5W-50 alot

I also think after 340+tkm the Turbo did its job well

Alot of turbos dont even last half of that

If you want give the 10/60 a try, as long as its not castrol

Liqui-Moly and Shell have those grades too if you cant find it from Mobil1

btw: forgot tho mention that my turbo is running about 20.30psi (1.4bar) out of the original K03
