Most of his advice is pretty good for a person who only keeps their cars for a couple years.
"Greasy kids' stuff. Unless your owner's manual calls for it, don't change every 3,000 miles. Also, don't waste money on more expensive synthetic oil unless your car requires it. Use only the grade and quality oil specified in your owner's manual."
True you will probably be OK going by the manufacturer's recommendations, but you could probably save money and have your car last longer with other methods.
"Un-classy chassis. If someone says your chassis needs lubing, check it out before doing anything. Most cars built in the last 10 years don't require lubrication. And if the mechanic says he can put in a fitting so the chassis can be lubed (pumped full of grease), don't fall for it. Adding grease where none is required could lead to problems."
Another half truth. The mechanic wouldn't be adding grease to a component that doesn't need it, he'd be adding it to a component that actually needs it to last longer.
"Filter fantasy. There are a plethora of filters -- oil, air, fuel, transmission -- on modern vehicles, and they all need replacing at some time or another. But not at every oil-change interval. Air filters often can be blown clean with compressed air and then replaced at every other oil change. Check the owner's manual for recommended replacement intervals for all filters."
It sounds like he's saying to blow it out and not replace it, but he really is just saying you don't have to replace it every oil change. This is often true on some cars and conditions.
"Injection deception. Sometimes cleaning fuel injectors means adding a bottle of fluid to the gas tank; other times it's a mechanical procedure involving a sort of pressure cleaning and chemical wash costing $50 and up. Either way, don't do it unless called for by the manufacturer. Few of them do. Gasoline is required to have a certain detergent component that will keep injectors and combustion chambers clean. If your vehicle is running rough, there are likely other causes and injector cleaning isn't likely to help over the long-term."
I agree to stay away from the shop injector cleanings, but fuel injector cleaning is needed, just save some money and do it yourself.
-T