I run the Delvac 15-40 dino changed @ 5k. Just put some snakeoil in it 2 or 3k miles ago (REV-X). Real impressed with the reduced noise & disappearance of any romps in any tune since. Never been a believer in oil additives but may be something to this stuff & the oil system on the 7.3.
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2000 F-250 SCLB 2wd 7.3 auto PHP stock-65t-80dd-120race-high idle-no start 4"tb exh, wicked wheel, 3 guages, AIS, coolant filt,
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