Is My Car Mechanic Giving Me Bad Advice‪?‬ Under The Hood show

What Engine Oil Weight do I use in my 1999 Chevy Suburban?
Why does my 1996 Silverado drop out of Overdrive?
Why does my 2012 Jeep get hot when I drive it hard?
Why do my Chevy Trax Cooling Fans stay running?
Do I really need ball joints on my Trailblazer?
How do I remove stuck Spark Plug Boots?
How do I pass a Smog Test in California?
Does my Ram Truck have a bad cam or bad oil filter? 
Does my Toyota Tacoma have bad Catalytic Convertors?