DOT 3 and DOT 4 Brake Fluid: What’s the Difference?

Glowing red brake rotor from heat

The primary difference between DOT 3 and DOT 4 brake fluid is their respective boiling points. I suspect I know your next question. But first, some background. The U.S. Department of Transportation (DOT) classifies brake fluid into four main categories:



Why Top Landscapers (Like Duluth Lawn Care) Trust AMSOIL

SABER Professional

Landscape professionals provide the most demanding proving grounds for two-stoke equipment. Their string trimmers, backpack blowers, chainsaws and other equipment run continuously in hot, dirty and wet conditions. And their brutal schedules leave no time for breakdowns.



What Should I Do with Used Motor Oil?

Container for used motor oil recycling

While most motorists pay someone to change their oil, 25 percent of us still crawl under our vehicles and do it ourselves. When we’re done, what do we do with the used motor oil?



How to Pick the Right Motor Oil for Your Car

conventional and synthetic oil

The glut of motor oils available can quickly induce analysis paralysis. How do you pick the right motor oil for your car?



What Motor Oil is Best for Winter? (And Other Cold-Weather Questions)

Synthetic oil is best for winter. We’re done here. If only it were that simple. But most people want empirical data to support such claims.



What is the Shelf Life of AMSOIL Synthetic Lubricants?

Pouring oil

AMSOIL synthetic lubricants are designed to retain their original performance after a reasonable period of time in your garage or storeroom. Proper storage ensures the freshest, most effective products possible.



How Engine Wear & Deposits Kill Horsepower

custom show truck at show

Most people equate engine wear and deposits with a sudden, catastrophic engine failure that leaves you stranded alongside the road. In reality, wear and deposits are more likely to erode engine power and efficiency over time. Here’s how it works and what you can do about it.



Should I Change Fluid in a Filled-for-Life Transmission?

Automatic transmission

Casual motorists generally take no interest in crawling under their vehicles on a Saturday afternoon. And, when was the last time you heard someone express excitement over dropping their car off at the dealership for maintenance?



Use This to Keep Mud Off Your ATV, Dirt Bike and More

Keep Mud of Your ATV with Mudslinger

If you spend your time racing down muddy trails or forging questionable terrain on your ATV, UTV, dirt bike, off-road truck or snowmobile (well, snowy trails for the latter), AMSOIL Mudslinger is about to be your best friend.



How Much Oil Does My Car Need?

The answer seems simple: probably about five quarts. But, if you drive a small car with a four-cylinder engine, it’s likely closer to four quarts. However, the V-8 engine in your truck could require about seven quarts. My in-laws’ RAM diesel pickup takes 12 quarts of motor oil.