1. Carnauba wax
   Water
2. Windshield washer fluid
   Xantham gum

We take it for granted now, but when the first windshield washer unit was sold in 1936, it was aftermarket. Today, brightly colored fluid containing methanol and sometimes other alcohols such as ethylene glycol are also added, is used to clean windshields, as well as rear windows and, in some cars, headlights.

1. Brake fluid
   Memory foam
2. Power steering fluid
   Sodium lauryl sulfate

It lubricates your car's power steering pump unit -- and that's important because that's part of the car's power steering system. Ultimately, by keeping the power steering pump unit running smoothly, power steering fluid is keeping your car's front tires moving.

1. Compressed air
   Gasoline
2. Methane
   Water

Known as gasoline among North Americans (in contrast, it's called petrol in the UK), it's been used to fuel our cars since the first internal combustion engine-powered vehicle rolled down the road.

1. Engine oil
   Hot air
2. Kerosene
   Petroleum jelly

Engines have a lot of moving parts, and the friction caused by that movement creates heat. Engine oil is what's used to keep all those pieces lubricated, and to make sure those internal parts don't get too hot.

1. Coal dust
   Dimethyl ether fuel
2. Molasses
   Synthetic engine oil

This type of engine oil is just as it sounds -- it's an engine lubricant, just like conventional oil, except unlike conventional oil it's engineered from artificial ingredients. Not every car will benefit from synthetic, but it's known to last longer than conventional -- and you can always switch back if synthetic isn't working out.

1. To dissolve grease
   To dissolve rust
2. To make removing nuts and bolts easier
   As a good, but temporary, fuel

Dissolve rust? Check. Dissolve grease? Check. WD-40 is just one of those things that's useful to have around because it can do so many things -- more than 2,000, according to the company that makes it. But as a fuel? Just say no.

1. The butane
   The ethylene glycol
2. The propane
   The transmission fluid

If your car has an automatic transmission and seems to be hesitating when shifting gears, the first thing to check is the transmission fluid. To do so: While your car is running and safely in Park with the parking brake on, pull out the dipstick from the transmission. Check the color and clarity of the fluid (it should be pink-tinged and nearly clear) -- if it's dark or smells bad, have it changed. Also, check the level of the fluid -- if it's low, top it off.

1. Diesel
   Hydrogen-powered fuel cells
2. Recycled restaurant grease
   Steam

Car companies Citroën, Mercedes-Benz and Hanomag were all featuring diesel engines in certain cars as far back as the 1930s. But it wasn't until the post-WWII cars, including those from Volkswagen and Peugeot, rolled off the line that the engine gained more attention for passenger cars.

1. Boiling chips
   A cryoprotectant
2. A lead replacement additive
   Melatonin

When it comes to caring for a classic car, specifically any car without hardened valve seats, you might need to consider a bottled lead replacement additive. Due to concerns about its toxicity, leaded gas began being phased out in the U.S. in the mid-1970s, and was finally gone 1996. Cars that once ran on leaded gas may benefit from lead replacement additive (specifically, tetraethyl lead, or TEL) to help boost octane and reduce knocking.

1. Clay grease
   Graphite dry lubricant
2. Olive oil
   Recirculating solvent

Graphite dry lubricant can be used on metal, plastic, rubber and wood surfaces to reduce friction and pressure on them -- without liquid.

1. Silver grease
   Mineral oil
2. Lard
   Dielectric grease

Dielectric grease is best used on electrical connections where you don't want moisture to penetrate. It's a silicone grease that doesn't conduct electricity, and is commonly used to grease your car's spark plugs.

1. Sulfuric acid
   High-mileage stabilizer
2. Friction modifier
   Formaldehyde

If a car's transmission "shudders" for a few seconds at speeds between 40 mph and 60 mph, the problem is often a slipping torque converter clutch. While it's a temporary solution, a transmission modifier added directly to the transmission fluid can stop the shudder. Until the 1970s, this was whale oil, but today these are non-solvent transmission additives containing a blend of friction modifiers and other petroleum-based additives.

1. Cold
   Hot
2. Rainy
   Windy

The first number in how oil is classified refers to its viscosity at certain temperatures. The lower the number, such as "5" in this instance, the thicker the oil will be at lower temperatures. At the low-temperature end, oil has to be resistant to thickening so that it flows more easily to all the moving parts in your engine. There's even a 0W, for when it's really really cold.

1. Beeswax
   Copper grease
2. Lanolin
   Paraffin wax

Copper grease is a thread lubricant that's used to prevent corrosion and seizing. It can withstand high temperatures, and is used on nuts and bolts, exhaust brackets, and to help prevent disc brake squeal.

1. Algaecide
   Chlorine stabilizer
2. Engine coolant
   Hydraulic fluid

Coolant, or antifreeze, is what protects the inside of your engine from corrosion, as well as from boiling over or freezing. Most types use ethylene glycol, which gives it its sweet, but dangerous, smell.

1. Acrylate polymer
   Boric acid
2. Instant adhesive
   Vacuum grease

It's vacuum grease that's made to seal and lubricate joints among other parts and pieces of vacuum systems and pressurized systems such as your car's air conditioning.

1. 2-stroke engine oils
   Deicing fluid
2. Descaling engine flush
   Differential fluid

Your car's differential is a gearbox that sits between the drive wheels -- and if you drive a 4WD vehicle, there is one in the front and one in the rear. The purpose? It's what makes your car's wheels spin -- the differential transfers the power your engine makes to the axles, which is what turns the wheels, and allows the car's wheels to spin at different speeds around corners. The lubricating fluid inside the differential reduces friction and keeps the gearbox running smoothly.

1. Yes, it is.
   No, it isn't.
2. It's the same only in diesel-powered engines.

Yes, radiator coolant is the same thing as engine coolant, and also the same thing as antifreeze. Its radiator is what's used to cool your car's internal combustion engine. It works, basically, like this: The force of the car's water pump pushes coolant through the car's engine block where the coolant heats up, before it then circulates through the radiator to cool down -- and then repeats.

1. Acetylene
   Biogas
2. Brake fluid
   Ultra-clean diesel

Brake fluid, which is a type of hydraulic fluid, comes in two main types: glycol-based, which is typically used for anti-lock brake systems (ABS), and silicone-based, which is used in vehicles without ABS. Brake fluid, which you'll find in your car's brake lines, is what keeps the components of the braking system moving.

1. Castor oil
   Gas compressor oil
2. Stem tube lubricant
   Transfer case fluid

In 4WD and AWD vehicles, the transfer case is what sends power from the engine to the car's front and rear axles -- it shifts the power from one axle to another, depending on what your traction needs are, which means a lot of wear and tear on the gears. That's where transfer case fluid comes in; it reduces friction and heat, and keeps those gears smooth.

1. Corrosion stopper
   Free rusted nuts and bolts
2. Remove an old bumper sticker
   All of these

Penetrating lubricant is low-viscosity oil used to loosen and lubricate in very narrow spaces, such as the threads of seized or rusted nuts and bolts. It's also able to remove adhesive materials such as bumper stickers from your bumper or gum from your carpet.

1. It corresponds to the model of car it's meant to be used in.
   It's the clarity rating.
2. It indicates if the oil is conventional or synthetic.
   It's the high temperature rating.

The second number on your oil, in this case the "40" in 10W-40, gives you information about the oil once the engine's running and the oil is heated up -- basically, the lower that second number is, the thinner the oil will be at 210° F (100° C), which is the normal temperature of your car's engine when it's operating. So a 10W-40 oil will be thicker when the oil heats up than if the oil is rated at a lower number, like 10W-30.

1. To clean a grease gun
   To lubricate a metal bearing with a grease gun
2. To protect rubber seals from moisture
   To remove rust from the body of the car

A grease nipple, also called a grease fitting, is a metal fitting that you or your mechanic would reach for when you need to use your grease gun to feed a lubricating grease into a metal bearing, for instance.

1. Bleach
   A vinegar-in-water emulsion
2. A water-in-oil emulsion
   Water

Your car's overheating and you don't have coolant? In a pinch, there's water -- long term it's not good for the inside of your engine block, though, because it's corrosive, so keep it to emergencies only.

1. Spindle oil
   Quenching oil
2. Neat cutting oil
   Air compressor oil

Think about how often it's turning on and off, again and again. There's a lot of wear and tear on your car's air conditioning system, but air compressor oil can keep the compressor in the A/C system running rust-free and smooth.

1. Bondo
   Dry glue
2. Rubber cement
   Tire and tube mounting compound

Reach for tire and tube mounting compound when you're mounting rubber tires -- or, as you might suspect, tubes. It's what lubricates the bushing, rubber-mounted spring shackles, and fan belts, and seals tire beads -- and it also has rust inhibiting qualities.

1. 3-in-one oil
   Furnace oil
2. Two-cycle oil
   A wet sump

Unlike the four-stroke engine in most cars, two-stroke engines are lightweight and mechanically simpler, with a higher power-to-weight ratio -- and often these small engines use an oil-fuel mixture instead of conventional motor oil. In these cars, it's two-cycle, or 2T, a "petroil" that's used to lubricate.

1. Coal oil
   Hydrophobic light-activated adhesive
2. Oil of brick
   White lithium grease

It's non-corrosive and waterproof, and it's engineered to work in any metal to metal situation where you think water penetration could be trouble.

1. Cobalt
   Lead
2. Neon
   Zinc

The chemical element -- and essential mineral -- zinc is added to white lithium grease. It's not for performance; rather, it's so you can see it.

1. It also cleans the engine.
   It also cleans the fuel system.
2. It also prevents gear friction.
   It also prevents cavitation.

They're both internal combustion engines, but they don't work quite the same way -- and that means the coolant used for a diesel engine is a little different than that used with a gasoline engine. Specifically it has to do with something called cavitation. Because cavitation, which is erosion of the cylinder walls, can happen in a diesel engine, diesel-friendly coolant is formulated to prevent that.

1. Fifth-wheel trailer plate grease
   Recycled vegetable oil
2. Red heavy-duty premium grease
   Wheel bearing and chassis grease

High-temperature wheel bearing and chassis grease is a go-to lubricant for both disc and drum wheel bearing applications. In addition to being able to handle the hostile environment, this grease is also water-resistant, anti-wear, and also contains corrosion inhibiting ingredients.

1. Crankcase oil
   Fuel stabilizer
2. Moly EP grease
   Semi-drying oil

If you're going to store your car (or any gasoline equipment, for that matter) for a length of time between 30 days and a year, a fuel stabilizer can help keep the gas in your tank from deteriorating. Plus, it can be used in all gasoline types.

1. Gear grease and gear oil
   Petroleum resin
2. Rubber seed oil
   Wheatpaste

Gear grease and gear oil is used in a car's transmission, transfer case and differential to reduce friction between the teeth of the gears, as well as to reduce the temperature caused by all that friction. Without proper lubrication, the teeth can wear prematurely -- and wear out prematurely, too.

1. Acacia gum
   Diatomaceous earth
2. Fuel system cleaner
   Sulfuric acid

Gasoline, in particular the use of ethanol as an octane-boosting ingredient in some types of gasoline, can cause build-up in your car's fuel injectors, on its intake valves as well as in the combustion chamber in the engine. Over time, the build-up can reduce your car's fuel economy, and you may find it also hurts performance. Some argue it's not necessary, while others swear by a pour-in fuel system cleaner to remove those byproducts.

1. Air filter oil
   Polysorbate 80
2. Urea-formaldehyde resin
   White spirit

When it comes to your car's air filter, especially if it's a high-performance filter, air filter oil can help it perform even better. Applied to the filter and allowed to dry, the addition of air filter oil means the filter is not only better at filtering out debris and other contaminants, it's also gotten a boost in water-resistance.