I decided to try the 10W-30 full synthetic supertech high mileage oil from wal-mart. One thing i noticed when im pouring it into the engine.. the oil is very very clear.. and it pours like water. Is that good sign, bad sign, or no sign or what?? Then i did another oil change with mobil 1 synthetic, and the oil is a darker color and pours with a little more viscosity. any comments on this??