Here's Why Toyota's Engines Last FOREVER!
When it comes to engine reliability of cars from any brand, there is probably no other brand which makes more reliable engines than the Japanese automaker Toyota. Now, have you ever wondered what magic Toyota does on its engine which makes them so reliable, durable, and long lasting? Well, today if you read this till the end, you'll know exactly why Toyota engines are supreme.
Unlike other automakers, Toyota does not cheap out and uses the highest quality and very heavy-duty materials to build its engines. The company uses a cast iron engine block which is extremely strong, excellent at handling heat cycles, and is generally more durable than the aluminium blocks used in modern engines.
As for the head and pistons of the engine, it uses aluminium which makes it lighter but heat resistant and less prone to thermal cracking. Overall, Toyota does not aim to make its engines lightweight because it does not aim to increase the fuel efficiency. Rather, its main purpose is to make the engine as durable and long lasting as possible.
The next big reason which makes Toyota engines supreme is their low states of tune. This means that the power outputs of Toyota engines are comparatively lower than the actual power they are capable of making. This is done to ensure that the engine does not get stressed and can deliver the same performance for a longer duration of time without getting damaged.
For example, the Toyota Innova’s 2.5-litre engine makes just 100 PS and 200 Nm of torque. Now, when compared to the 1.3-litre diesel engine from the Maruti Suzuki Ertiga, which makes the same amount of torque, the Toyota outlasts it on every single metric. Toyota lowers the turbo boost of its engines to make sure that they get less heated.
Also, the RPM limit is lower, around 4,400, which means that the engine makes fewer revolutions and wears off slowly. In addition, Toyota tunes its engines in such a way that a lot of torque becomes available at low RPM. This allows easy pulling power without the engine getting stressed and wearing out less. This is why many Toyota Innovas run smoothly at 3–4 lakh km.
Modern car engines are filled with complex sensors, high-pressure injectors, small and highly stressed turbos, and dual mass flywheels, allfnskrj variable valve systems. However, Toyota deliberately avoids unnecessary complexity.
The logic behind it is that fewer parts mean fewer things break. Also, this makes the diagnostics very easy, and heat and stress are generally very low in Toyota engines. Lastly, mechanics anywhere across the country can repair them without using any special tools.
All engines require extremely efficient and good oil flow. An oil pump of an engine should be able to deliver oil to all engine sections, including the turbo, and if it fails to do so, the engine dies. Now, Toyota’s D4D lubrication system ensures that there is a constant supply of oil at every RPM.
It also makes sure the friction inside the engine is as low as possible and the pistons and crankshafts are cooler. Additionally, the turbocharger’s life gets increased due to this. Lastly, the sludge formation of this engine is also very less. This particular oil supply system, even in India's hot weather conditions, keeps the engine well lubricated.
Toyota ensures that its engines are built with precision machining, high-quality casting, and tight tolerances. These engines produce very low vibrations, which means that they wear out very slowly. Every engine is overengineered as Toyota assumes that it will go through bad driving, bad fuel, high temperatures, and low-quality oil changes. So, these engines are built to survive in these conditions. And we'll leave you with a video that interviews the man whose Qualis has done a whopping 8 lakh kms on the stock engine.