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I am on the road just about every day.
I drive an F350 CC Dually w/ a 7.3 PSD & a manual ZF five speed tranny - usually I am towing 10,000 pounds. I have tried oil additives over the years along with several brands and oil weight combinations. Recently I ran across independent oil testing data performed & published by an individual: @ https://540ratblog.wordpress.com/ Although lengthy & arduous it was fascinating to read. The oil additive that consistently seemed to have proven measured results was Oil Extreme: @ http://www.oilextreme.com/oil1.html I called & talked with the owner Dan - then ordered a 16 ounce bottle. For my truck I chose this oil from the test data link above: 113. 5W40 MOBIL 1 TURBO DIESEL TRUCK synthetic, API CJ-4, CI-4 Plus, CI-4, CH-4 and ACEA E7 = 74,312 psi zinc = 1211 ppm phos = 1168 ppm moly = 2 ppm I have been running Mobil 1 synthetic oil filters since they came out a couple years ago. My engine takes 15 quarts so I added the recommended 15 ounces. Then I drove a few hundred miles .... I noticed an immediate gain in horsepower - fuel economy - performance. I will be adding Oil Extreme to my ZF manual transmission & my 4:10 rear differential. Jim
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