How to Fix Blow-by on a Diesel and Save Your Engine

Finding out how to fix blow-by on a diesel can feel like a death sentence for your truck, but it doesn't always mean you need a brand-new engine. It's that annoying puff of smoke coming out of the oil filler cap or the dipstick tube that tells you things aren't sealing up the way they used to. While every diesel engine has a tiny bit of blow-by—it's just the nature of high-compression engines—there's a point where it goes from "normal wear" to "I need to do something before this engine grenades itself." ...

March 6, 2026 · 6 min · Ciobarnu Manpreet