That old timer at the truck stop in Amarillo who said modern DEF systems are a waste

I was fueling up my service rig last fall and got talking with a retired fleet mechanic. He said, 'All this DEF junk just makes a simple engine complicated for no real gain.' But my shop sees way fewer regen cycles and cleaner exhaust on the newer trucks. Who's got it right here?

Spent $60 on a 'Python for Dummies' book and my cat chewed up the chapter on loops lol

Been using a 000 blade for my bald fades for years. A client in Tacoma changed my mind.

He had really coarse hair and my usual method left a visible line. I switched to a 0.5 guard on a detachable blade clipper for the initial guide line. The blend was way smoother, no more harsh jump. Anyone else find a specific tool works better for certain hair types?

Why does nobody talk about the coolant leak that always starts behind the EGR cooler on a 6.7 Powerstroke?

Had a 2015 F-250 in the bay yesterday with the customer saying it was just 'using a little coolant', but after pulling the turbo and intake, the whole valley was full of green sludge from a pinhole leak in the heater hose right where it goes into the cooler. What's the fastest way you guys have found to get that lower clamp back on without dropping it into the abyss?