Royal Purple 5 quart?
I have only ever seen it in individual quarts. AutoZone used to carry it, but I have not seen it at my local one in a while.
Amsoil is a lot better than Royal Purple in my opinion. I could tell more difference with it.
Amsoil is a lot better than Royal Purple in my opinion. I could tell more difference with it.
Less valve tap in the mornings was the main thing. Its almost impossible to feel the HP/Torque difference between motor oils, but when I switched from Royal Purple to Amsoil, I could feel a slight difference. Its possible that the Royal Purple was less effective after 5000 miles than the brand new Amsoil... They were definately neck and neck. Royal Purple is an awesome motor oil, but Amsoil is slightly better.
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