[dieselmonkey]

i put royal purple in my car and i heard after the 3000 mile mark you can just replace the oil filter and and a quuart of oil if this is true let me know

[SVT1995]

I couldnt tell you that one. But it better be for the price for a full oil change!!!

[Stormmotor]

I would always replace all oil at three thousand but yes it is true along with the ams oil. But the main plus to royal and other top quality oils is the friction modifiers in them which gives you a little bit more hp and gas mileage also protection, BUT if you have worn rings or any type of oil leak do not run the stuff. it will just clean the gap or hole whatever of all debri and cause leak to be worse and more noticable