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Message: <blockquote data-quote="Schwepps" data-source="post: 269491" data-attributes="member: 3592">In modern manufacturing processes, the piston rings are already seated at the engine plant in a controlled process before shipping to assembly. That's why most cars don't require a run-in oil change these days. They certainly don't need you to do a so-called 'hard break-in' yourself.In their recommendations, manufacturers are talking about running-in the entire running gear of a car which includes the suspension, gearbox, brakes and tyres. Certainly you don't have to baby it, but you shouldn't rev past 4k or kick down or accelerate/brake too hard to let all the mechanicals and rubber seat properly.And they're not talking about motorcycles either...</blockquote>