Hi Turboken,
I had the same problem and it was driving me crazy!..lol I found my solution after some times of having the screen tearing issue with P3D2.5 and v3.
Now, this is if your running windows 7. You have to turn on Aero Desktop and it will get rid of the screen tearing. I turn it on and the screen tearing is completely gone!..I couldn't believe it. I've had that off for years!...I remeber another game I use to have screen tearing, now I know why!! I never would have figured it out if it wasn't for someone that mention it on YouTube during my research into this
So, make sure you select as a desktop background to Aero in Windows 7
Hope it helps!