Not opening the engine just because it isn't giving you a problem is a very bad idea. Once it starts to give you a problem it's too late and likely going to be a costly repair.

The more guys I hear getting more miles in than me the more I like it. I hope it is an idication of what I might expect.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!