I am upset with the service dept. I've been takin...

I am upset with the service dept. I've been taking my Tacoma there for several years. The service manager argued with me about putting synthetic oil in my truck. He told me that it wasn't necessary and that the normal Toyota oil is what he recommended. When I said Id prefer a better quality synthetic he became agitated and asked, "WHY?! We have trucks coming in here with hundreds of thousand of miles that haven't had synthetic oil." I took my truck to a local Toyota mechanic who told me Mike Johnson only want their customers to use the Toyota oil because you can drive less miles between oil changes and therefore you pay more to come back and get your oiled changed. My new mechanic also told me that my bearing were dry and that Hickory Toyota has failed to do the simple take of greasing them. My new mechanic suggested I use a full synthetic in my truck just as I assumed would be best. I went to mike johnson because I thought they were a reliable and trustworthy service dept. I will NEVER GO BACK to these guys!