Hydrogen fuel cells sound great – inexpensive, easy to build and install, save huge amounts of money on your gas or diesel bills – but what are they, and do they really work?

The brake pads on light vehicles should only need to be replaced every 50,000 miles or more. Heavy SUVs, on the other hand, might need to have them replaced at 35,000 miles. The pads usually cost less than $80 and can be installed at home. However, if the rotors need to be machined, you’ll need the tools and expertise of a mechanic. Expect to pay up to $500 (and maybe more).

Kilowatts – A measurement of power. The more kilowatts, the more power – and in car speak this usually means greater speed. 1 kW = 1.341 bhp (brake horsepower).

Service your car at least every year. Get the engine tuned, the wheels aligned and catalytic converter recycling checked, and the air con re gassed if you insist on using it.

First walk around the car and mention any defects to the seller, in a very casual and polite manner. This helps in getting the seller in touch with reality. But be friendly.

Make small talk. Like, “wow, how did that happen? Ask him if he has replaced any parts. Also ask the seller if he knows of any problems. Things that may need to be replaced in the near future.

Open up the garage door. Letting your vehicle run inside a closed garage can be deadly. Fumes will quickly accumulate in the garage and spread to the remainder of the house if you have an attached garage. If you must run your car inside of the garage, vent it by opening up the garage door. Always keep the door from the garage to the rest of the house closed when your car is running inside of your garage.

If you determine that your exhaust system does need maintenance, you can do the work yourself and save plenty of money. Top performing exhaust system brands include Bosal Exhaust, Dynamax Exhaust, Gibson Exhaust, Flowmaster Exhaust, Magnaflow Exhaust, Remus Exhaust, as well as others. Selecting the right system for your car can help you reduce noise, increase torque, and free up horsepower. Above all, a well fitted, properly installed system will protect the environment both inside and outside of your vehicle.