I don't know what to think! :-\

[Scott]

I change the oil every 3k. The manual says 7500, but what I have done has lasted this long, so why change it?

So it would not have lasted as long changing the oil at 7500 miles?

I have no idea, maybe it would have been fine, and maybe it wouldn't have, but it's worked this long so I'm not going to change it, it doesn't seem worth the risk