Some Good Advice

I have a hard time trusting mechanics in general.  I always think that they are scheming to get more money out of me.  Whenever I take my car into the garage for something, I end up getting something totally unrelated worked on as well because they deemed that it was necessary.  It always costs me whenever I see a mechanic which makes me weary whenever they give me some advice.

I asked a local mechanic about which oil I should use on my outboard engine.  I told him that I usually use Mercury Optimax Oil but I was thinking of using something else.  He told me that as long as I stick to one brand, I should be fine.  If the oil I was using wasn’t causing me any problems, then there was no need to change it.  I was surprised he didn’t try to up-sell me and make me buy the most expensive brand of oil out there.  I was thankful of the truthful answer he gave me.  Why can’t more mechanics be like him?