8 Car Care Tips at 300,000 KMPosted by Amsoil, 8th October 2018

The average car on the road in Australia is 10 years old, and the average owner puts on 13,716-km per year. If you’re one of these frugal folks – congratulations. But a vehicle that has accumulated 300,000-km is going to have a few battle scars. Here, we offer our top 8 tips for car care to help keep your 300,000-km warrior humming along.


Here’s what we’ll cover:

1. Seek out seals

2. Change your power steering fluid

3. Brake fluid maintenance

4. Clean the mass air flow sensor

5. Clean the fuel injectors

6. Assess the air conditioning

7. Replace the engine and transmission mounts

8. Check the timing-chain tensioners


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1) Seek out seals

Time takes its toll on all of us. Your vehicle’s axle, driveshaft and other seals are no exception. Seals are out-of-sight, out-of-mind, meaning we don’t think of them until we notice a small transmission fluid stain on the garage floor. Eventually, that small stain grows into a big problem.

Replace seals before they leak to help avoid a mess on your garage floor and – worse – the loss of fluid, which can lead to overheating and wear. Bad seals allow dirt and other contaminants to enter the system. Soon the fluid goes bad and can lead to expensive repairs or a breakdown.


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2) Change your power steering fluid

Power steering fluid may not appear degraded, but its anti-corrosion and anti-foam additives deplete over time. This accelerates wear to the pump and rack. Sometimes if the power steering fluid has degraded, you’ll hear a high-pitched whine coming from the pump.

Be proactive and change the power steering fluid. A simple but effective method is to use an extraction pump or turkey baster to remove fluid from the reservoir. Top-off the reservoir and drive for a while. Repeat the process a few times for a simple power steering fluid change.


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3) Brake fluid maintenance

Brake fluid naturally attracts moisture, which can enter the system through microscopic pores in the brake lines and through the reservoir cap. The fluid can only handle so much water before it’s compromised, which reduces its boiling point and performance. This leads to brake-line corrosion and, worse, a spongy pedal. Soft brakes are not only annoying, they’re dangerous.

So how to change brake fluid? A good rule of thumb is to change brake fluid every other year. It’ll help prevent the lines from corroding and ensure a safe drive.


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4) Clean the mass air flow (MAF) sensor

Your engine has consumed tons of air on its way to 300,000-km. The MAF sensor measures the mass flowrate of air into the engine. The engine’s computer uses this information to inject the correct amount of fuel into the engine to achieve optimum efficiency depending on operating conditions. Over time, the sensor can become dirty and provide false readings. Common symptoms of a dirty MAF sensor include reduced fuel efficiency and a rough idle.

Clean the MAF sensor with a cleaning product specifically designed for the task. Not every cleaning product out there is meant for MAF sensors, so read the label carefully.


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5) Clean the fuel injectors

To reach 300,000-km, an engine will burn 30,000-38,000 litres of fuel. In each fuel injector, a small needle opens and closes millions of times as thousands of litres of fuel are burned in front of it. Plus, the fuel is sprayed through tiny openings in the injector tip. Dirty fuel and extreme heat – especially in direct-injected engines – cause carbon to build up on the injector tips. This interferes with the spray pattern, reducing power and fuel efficiency.

Use a good fuel additive, like AMSOIL P.i., every few thousand miles to keep the injectors clean and firing properly.

Dirty injector tips, like the one on top, interfere with the fuel spray pattern, reducing power and fuel economy.


6) Assess the air conditioning

Your air-con system may not be what it once was due to plugged cabin filters, stuck blower doors or a weak blower motor. Use an anemometer, which measures air speed and temperature, to find air-flow restrictions and determine if the system needs to be recharged. If you’re going to go beyond 300,000-km, you want to be comfortable, so do a little air conditioning maintenance.


7) Replace the engine and transmission mounts

This may seem to be a no-brainer but holding the engine and transmission in place is an important job. Constant torque and vibration can cause the metal and rubber in these mounts to crack and eventually break. In general, worn mounts don’t provide much early warning, but when they go, it’s noisy, rough and potentially dangerous.

Next time you’re under your vehicle, examine the engine and transmission mounts for cracks. Replace them as needed.


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8) Check the timing-chain tensioners

Made from composite materials and actuated by springs or hydraulic pressure, timing-chain tensioners are designed to wear and become brittle due to the number of engine-heat cycles. Hydraulic tensioners can also wear and leak. In addition to illuminating the engine light, symptoms include noise and rough running.

As its name indicates, the timing chain controls the timing of valves and pistons. When it or the tensioners fail, the engine usually goes with it. Replace the timing belt and tensioners according to the recommendations given in your owner’s manual.



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