One can save money by driving a car without CD changer, no sunroof, but don't save money on oil - it directly affects the longivity of engine. Recommended:
(1) Follow user manual. If it specifies the type of oil to be used, make every effort to get it, even though that means you might need to spend more money.
(2) If no specification of oil on the manual, buy quality oil, like Castrol.
(3) Pay attention to the oil numbers - they really mean something. For example, for diesel engine, if no specific requirement, use 40w15, for gas engine use 30w5 (newer cars), or 30w10, and so on.
(1) Follow user manual. If it specifies the type of oil to be used, make every effort to get it, even though that means you might need to spend more money.
(2) If no specification of oil on the manual, buy quality oil, like Castrol.
(3) Pay attention to the oil numbers - they really mean something. For example, for diesel engine, if no specific requirement, use 40w15, for gas engine use 30w5 (newer cars), or 30w10, and so on.