I took my car (200k mile Civic) in for the snow tire change and an overdue oil change (5500 miles on dino). The oil I checked a week before was quite dark (Mobil 10W-30 HD). Anyway the newly installed oil (also Mobil 10W-30HD) is also pretty darkish already, typically clear gold for first 1000-2000 miles when I noticed. I have only driven approx 200 miles. Does this mean anything or is it just particular to the oil?