Yes, They Sound Dull, But Hear Us Out On Oil Catch Cans

Every time a piston fires, a wisp of combustion sneaks past the rings, dragging vaporized fuel and microscopic oil droplets back toward the intake. The cleaned-up air continues on to the intake, while the goop stays in the can until you empty it during your next oil change. Direct-injection engines are already fighting an uphill carbon war, as Jalopnik's deep dive into Audi's TFSI tech explains — fuel never washes those valves clean, so whatever doesn't end up in the catch can ends up as baked-on crud.

Author: staff@jalopnik.com (Greg Poggiali)

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