I think a redline is there to be used from time to time. However, I think 2,500-3,000 rpm on a cold petrol engine is about the maximum amount of revs to ensure longevity. It really grates me when I see people with great cars 'racing' their engines from cold. With regards to modern Diesel engines, I think 'blowing the cobbwebs out' every so often is the best thing you could do. DPF filters do get clogged and ironically a constant economical driving style will compound the problem.
I enjoy my cars but I do so in a responsible way.
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