then I will have no comment, when I see him next time. he using 10w/30 super tech and super tech oil filter, I might tell him change one a month. We did many important maintain on that car, like plug and wire and seafoam, brake fluid,tranny and rear fluid, change new driver belt, fuel filter, he use factory stuff but when to oil he just use walmart cheap brand and change it often, he say that car give him 15-17mpg, he never turn off his car when I park outside people house, and when he get back he turn off his car and 5-10min later he had to go again, I think he is working 7-10 hours a day, that what he told me. Thanks for all the rely.