Does Royal Purple maintain its purple color after it’s put into service?

Should I use an oil additive with Royal Purple?
August 17, 2018
Do your motor oils contain zinc/phosphorus?
August 17, 2018

Does Royal Purple maintain its purple color after it’s put into service?

No. The dye that’s used to color the oil dissipates shortly after being put into service. The oil will appear brown at some point.