What is Total Base Number?

I have had first hand experience with  AMSOIL for years. It is the only oil I use in my Diesel truck, Honda Accord, Honda CRV, my beloved 32 Ford Roadster, Harley Davidson Street Glide, Polaris XPT, Toro zero turn, Honda snow blower, Yamaha Outboard, and Onan generator. Yeah I buy a lot of AMSOIL but …

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