Just thought some of you would find this interesting.My oil is still very clear on my Kubota diesal engine. 33 hours after the 50 hour oil change. The engine is a 3 cylinder common rail diesal.35 horsepower with 88 ftlbs of torque at 1600 rpm. Really surprised as most diesal oil I have seen is black with only a few hours on it. Using Mobil Delvac Extreme 10w30 synthetic.