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The guy was trying to do you a favor, as well as making a (very) few bucks for himself.
I've been running AMSOIL for over 24 years now. I did oil analysis on an number of cars, including my 85 245turbo. The oil was still suitable for use after 11,500 miles, 3 times the recommended oil drain interval.
If you can accept the recommended extended drain (backed by over 30 years of oil analysis and experience, AMSOIL becomes the least expensive option in cost per mile/hour of operation.
Mobil 1 is excellent oil, but AMSOIL is better in wear protection and fuel economy, along with some other standards.
I currently use AMSOIL Series 2000 in all my vehicles. Don't drive as much as I used to, so don't rack up as many miles. Usually change oil yearly, or use oil analyis to extend the drain. The service life of AMSOIL is 25-35,000 miles OR 1 year for non-turbo/non-diesel applications (AMSOIL filter change at 1/2 interval).
For turbos/diesels the service life is double the manufacturer recommended drain, or longer based on oil analysis.
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