Originally Posted by Mxfrank

My 190DT is approaching end of life, at 455K miles. It's been a bit grumpy in the morning, smokes a bit, and struggles when it's cold. My first impression after 100 miles with this stuff, is that it's running significantly better. Maybe just placebo effect, but I really think it's improved. It makes zero sense...how can adding a solution of wear metals to the oil fix anything? I wish I had taken the time to check compression before I installed it.