My '01 Civic EX, 235K miles (mostly I-95 commuting @ 100 miles/day) is using
about 1/2 qt. 5W-20 per 4000 miles.
I go 8000 miles (4 months) between oil changes. (Maint.manual states 10,000
mi. interval). Should I start thinking of using a heavier oil, 5W-30 ,
at this time ?