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Message: <blockquote data-quote="El-Anders" data-source="post: 138611" data-attributes="member: 4086">If its OK, to talk about a car engine in this forum, I would like to take the Volvo 5 cyl as an example of how much stronger the valves and seats has become. When I worked with cars, every car needed a valve adjustment when they had an oil change done, every 6000 miles (10000) km. Except a few , like Alfa Romeo and some others with shim adjustment. This is the 70s.Since 2002 Volvo removed the hydraulic lifters, because they say that there is no need. The valve lash is set with shim from factory, and there should be no wear in at least 200 000 miles. I had an 1995 5 cyl. with hydraulic lifters. For sure they could rattle for 30 seconds a cold winter morning. (The engine had around 150 000 miles). But I liked the silence from the valve mechanism when hot.Now I have a 2002, (160 000 miles) and there is a slight ticking. Is this because of wear? Was it like this straight from the factory? It irritated me in the beginning, but since I learned how difficult it is to shim the valve lash I just live with it.Out of topic a little there. I just wanted to point out how much improvement have happened to the steel they use in valves, and seats.</blockquote>