have changed oil weight.
oil loss, replace 2 qts every 3 months. no leakage or signs of burning on 2006 Mazda Tribute
A cylinder leakage test may show leakage past cylinder rings. If the engine isn't leaking it the oil must be being burned or consumed in the engine. How many miles are on the engine and how many miles do you typically drive in two months. Perhaps check the PCV valve to see the engine is "breathing" properly.