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I never pay attention to factory recommended engine oil. They all get mobile 1 or sometimes Amsoil, Now transmission, that's another story. I know Honda is very specific about their Transmission oils especially in the S 2000. I tried and tried to use similar after market oil from Mobile to Valvoline, no dice. Switched back to Honda oil, the shifting was so much better. They were $1.50 more per qt. I know some Mazda requires their own transmission oil also. I just put in Valvoline tranny oil in my Toyotas and they have been fine. Castro TranSynd in the Allison. Simple and are all good.
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