I recently switched to valvoline because I came across a lot of it from a friend. In my '97 explorer sohc, I used pennzoil for the last oil change then valvoline this one. On the pennzoil change, the oil got dark/black around 1800 miles and im currently at 4100 on the valvoline and about to change it. The valvoline is still 'honey brown'. I've driven no different so I'm wondering is valvoline not as good at cleaning out the motor? I'm going to switch to valvoline hm this time because again, I got some cheap. Thanks for the help guys.
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