It has nothing to do with SOL. It is a shader patch 'problem' or rather because the far plane is set too low. Go to Shader patch settings in CM, find the Graphic Adjustments settings on the left, then the Far Plane settings. Set them to 35000, 40000 and the problem is solved. This might give you lower FPS though and so far it's the longest I have had to set that number. Maybe consider moving the mountains closer to the track?