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your right
Your correct it dont say on the mobil 1 bottle how long. The exstended stuff does. I run my mobil 1 about 5,000 miles, but i may try the exstended 15,000 stuff. I would try amsoil, but im just not convinced its any better than mobil 1. Mobil 1 does have a 5000 change oil, 7,500 change oil, that is a synthetic blend.
mike
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