it was stated in the numbers in their brochure to justify cost savings. Di ko actually sila nakausap, yung tao ko sa motorpool ang kausap nila and they left the brochure. Didn't bother to talk to them because for me, 30K is too long. Even if your car/truck's oil using conoco can last that long, mas maganda to change oil more frequent coz you get to check your car's condition as well.