I have several questions regarding synthtic oil. Have others noticed a gas
mileage increase with synthetic or synthetic blend oil?
I just switched to synthetic blend in my 1996 Integra LS about 6000 miles
ago. I noticed my highway mileage went up about 2 mpg, from 32 to 34 with
the switch to synthetic. Is this similar to what others have seen?
I was having the oil changed at 3500 mile intervals, but went to 5000 with
the synthetic. I have 80k miles, drive about 8000 miles a year, mostly
highway. Is a 5000 mile interval reasonable, or could I stretch it to 7500?
7500 would end up making it an annual change. I live in central North
Carolina, where it hits the 90's in summer and the 30's in winter.