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Saw the inside of a 7.3 Powerstroke after 15 years of neglect and it changed my mind about oil additives

I pulled the valve covers off a 1999 F-250 last week that had 280k miles and supposedly never got anything but the cheapest 15W-40. The sludge buildup was something else, thick and crusty all over the rockers. Then I did a similar job on a 2002 with similar miles but the owner used a certain additive every oil change. That engine was clean like it was rebuilt last year. I mean, is there actually a science behind those additives or is it just the luck of the maintenance schedule?
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2 Comments
calebm46
calebm461mo ago
Nah man you just discovered the secret. It’s all vibes and snake oil... or exactly what you think it is.
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nina_clark
nina_clark1mo ago
Wait, is this actually a thing people get worked up about?
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