Most companies test their oil before it goes in the bottle. At Quaker State^®, we wanted to know how well our motor oil performs at the end of an oil change, after thousands of miles of real-world torture. So we put Quaker State in hard-working New York City taxis, turned them loose and the punishment began.

Then we took that used oil straight out of the taxis, sent a collective sample to the lab and subjected it to the same industry tests used to evaluate brand-new oil. And guess what? Even when it was ready to be replaced, used Quaker State still passed critical industry tests for wear protection, rust protection and viscosity.*

Used Quaker State passes these tests for brand-new oil:

Click on each test to learn more.

*Viscosity test ASTM D445; wear test Sequence IVA; rust test ASTM D6557. Always follow the manufacturer’s recommendation for oil change intervals.