I'm posing this question because on Valvoline's website they list the benefits of High Mileage oil and synpower. However, they make it sound like the Maxlife blend is better than Synpower. They also leave the door open as if to assume that just because you use Synpower (or any synthetic brand) that a high mileage engine really would do better with High Mileage oil. So which is it? On our van, I've recently replaced the timing cover gasket and oil pan gasket, so I no longer have any oil leaks and thought of going with PP or Synpower since they are both so cheap. My engine has 85k on it.