I am posting some data from my 2000 Jeep Grand Cherokee with the 4.0 Engine.
Below are 3 samples and the supporting data.
Sample #1 Mobil 1 10w30
Sample #2 Schaeffers Supreme 10w30 Blend
Sample #3 Schaeffers Supreme 10w30 Blend
No makeup oil on any of the 3 samples.
Sample...
