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Message: [QUOTE="Denver, post: 1499048, member: 608"] I change my oil about once a month and started doing it myself about 6 months ago. I drive a 7.3. First change I used rotella. The next ones I used the delo 400 ck4/sn. The truck ran smoother overall with the delo. Easy starts like it had been plugged in. After reading the ck4 statement I switched back to rotella this last change. Its on the approved list but its still a ck4 oil. Engine does start without hesitation but I do notice a difference and its just not as smooth. The blowby smell is bad with the rotella. It was nonexistent with the delo. The next oil change I'll go with this 8700 oil and report back. [/QUOTE]

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