I have a 2008 Sprinter MH with a diesel 3.0 engine. I last changed oil Oct 2020 and have driven it 750 miles. My son told me no need to change the oil, since the manufacturer calls for oil change every 10,000 miles (but also states 2 years). I feel the oil should be changed because of the time element. Please advise if the oil should be changed now, or if it is ok to continue to use the unit as is. Thank you.