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I have used Schaeffers 7000 for years in many diesel engines an I will most likely keep using it but......With this new 15w-40 T6 I have been seeing, a guy gets to thinking, is saving nearly $12 a gallon worth the switch from Shaeffers 7000 to Rotella T6? $12 a gallon savings really starts to...

Just had this test run on a sample of my Rotella T 15w-40 run in my 6L powerstroke. I went 7,500 miles on this change, I would say 90% of these miles are highway miles. Truck truck had 140,000 at this change. So how does the sample look? This is the first test I have ran on this truck so I have...