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As an experiment I used Mobil 1 in my 1989 Pontiac Grand Am. I kept in in for exactly 100,000 Km (Approx 60,000 Miles I think). I changed the filter every 5000 Km and only had to top up with Mobil 1 at that time. That Quad 4 went for approx 350,000 km and was still running fine and not using oil, when a drunk turned left in front of me at an intersection. Try that with regular oil. I just did the the first oil change on my VFR and used Honda Oil and a Honda Filter. Why are Oil and filters from bike shops so expensive?