I take my ute to the dealer workshop for all its scheduled 9 month/15,000 km. But change the oil/filter privately every 7,500 km at a local garage, I supply oil/filter and they charge $82.50 for the work. Any good quality and correct grade engine oil is fine. Many years ago I worked at a garage where we used a so called "multi-grade" engine oil pumped from a big drum to service all different models. None of the cars we serviced had any major engine problems. But then back in those days, engines were less high tech and rather robust.