Myth: Engine oil should be changed every 3,000 miles.
Reality: Lots of people believe that their oil should be changed every 3 months or 3,000 miles. Most cars now can go 7,500 to 10,000 miles before a oil change is required. I usually change my own between 4,500 and 5,000 miles and my F-150 Supercrew truck is still going strong at over 139,00 miles. Despite what the oil companies and quick-lube shops try to make you believe, it is not necessary to change every 3,000 miles. Check your vehicle owner's manual to see what the service interval is for your car or truck. Under normal driving conditions, most vehicles are designed to go at least 7,500 miles and some can go up to 15,000 miles between oil changes. Changing oil more often doesn't hurt the engine, but it can cost you a lot of extra money. It is often recommended that your oil be changed every 3,000-mile intervals for severe driving conditions, such as constant stop-and-go driving, frequent trailer-towing, mountainous terrain.
Myth: Flush the coolant with every oil change.
Reality: Radiator coolant doesn't need to be replaced very often. Most owner's manuals recommend changing the coolant every five years or 60,000 miles. Of course, if the level in the coolant reservoir is chronically low, check for a leak and get service as soon as possible. When you do change your coolant and your coolant says it should be mixed, use distilled water, not tap water, which contains minerals that can cause trouble.
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