I have a '92 Mazda Protege with the 1.8L engine,44,500 miles. I changed the oil last October (Mobil1 5W30 SL with a Super Tech filter) and parked it for the winter. In April I put the car back in use for the summer to commute to work and run errands. One way to work is two miles, most errands about the same. Twice a month out on 20 mile runs to warm the oil as you all recommend. Since fuel is so high this year I will be using this car for work this winter, can I run this oil until the spring or should I change (Mobil1 5W30 SM)? Thanks.