When my truck was new, I used Rotella-T and changed it and the oil filter (Ford filter, BTW) every 5,000mi. That worked well when I was racking up roughly 100,000mi a year. Every other month my oil was tested by Blackstone and showed no problems.
After ~3 years and about 270,000mi, my driving dropped off. Then I began having injector 'stiction' issues.
Long story short... no more stiction and I've settled on Rotella-T6 and change the oil and filter every 6 months (sometimes the miles hit 7,500).
It now has ~340,000mi and is running great. (fingers crossed)
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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