Think premium fuel is better for your car? Think again. Unless your vehicle specifically requires it, using premium gas could be costing you more without delivering any real benefits.

Gasoline is sold in three grades: regular, mid-grade and premium. The main difference between the grades is octane, which is the ability of the fuel to resist harmful detonation – also known as pinging, pre-ignition, or spark knock. As long as your engine does not detonate on a given grade of fuel, there is nothing to be gained by spending more for a higher grade. Contrary to popular belief, premium grade fuel does not contain more energy, burn cleaner or improve fuel economy in vehicles that do not require it.

Modern engines are equipped with knock sensors that allow use of lower grade fuel if the required grade is unavailable. However, engine performance and fuel economy will suffer. Never use less than the recommended fuel grade when the vehicle is heavily loaded or being used for towing.

Engine oil: it’s not just about color

Many drivers believe dark oil means it’s dirty and needs changing. But modern oils—especially synthetics—turn dark because they’re doing their job: suspending particles and cleaning your engine. Color alone isn’t a reliable indicator of oil health.

Instead, rely on your vehicle’s maintenance reminder system or owner’s manual. Many newer cars can go 7,500 to 15,000 miles between oil changes, depending on driving habits and oil type.

Look for the API “Starburst” and “Donut” symbols on oil containers to ensure you’re using the right formulation for your engine.

Coolant: color can be deceiving

Coolant does more than prevent freezing—it cools your engine, lubricates seals, and prevents corrosion. But here’s the twist: coolant color doesn’t tell you what type it is.

There are three main types:

• IAT (green): for older vehicles, needs frequent changes
• OAT (orange/red/yellow): long-life, used in many GM and import vehicles
• HOAT (yellow/orange): hybrid formula used in newer Ford, Chrysler, and others

Mixing types can cause chemical reactions and damage your system. Always check your owner’s manual before topping off.

Transmission fluid: the multi-tasker

Automatic transmission fluid (ATF) does more than lubricate—it operates hydraulic systems, cools the transmission, protects seals, and smooths gear shifts.

Many manufacturers require proprietary blends and using the wrong one can shorten your transmission’s life. Watch for signs of trouble like a burnt smell, dark color, or milky appearance.

Brake fluid: a moisture magnet

Brake fluid absorbs moisture from the air, which lowers its boiling point and can reduce braking performance. That’s why it’s critical to check both the level and condition.

• DOT 3 and 4: clear to amber
• DOT 5 (silicone): light purple, not for ABS systems
• Dark or black fluid? Time to replace it

Use test strips or check the color. Brake fluid can damage paint, so handle with care.

Power steering fluid: buzzing isn’t normal

If you hear a buzzing noise when turning the wheel, your power steering fluid might be low. Some systems use automatic transmission fluid, while others require a specific type—check your manual.

If you’re topping off more than once a year, you may have a leak that needs professional attention.

Small checks, big payoffs

Your car’s fluids are more than just maintenance items—they’re vital to your safety and your vehicle’s longevity. Here’s your quick checklist:

• Check oil level and follow your car’s maintenance reminder
• Use the correct coolant type—don’t trust color alone
• Monitor transmission fluid for color and smell
• Test brake fluid regularly and replace if dark
• Listen for steering noises and check fluid levels
• Use the right fuel grade for your engine

Not sure what fluids your car needs, how to check them, or how often they need replaced? Visit a AAA Approved Auto Repair facility for expert service and peace of mind.

Approved Auto Repair