How long do school bus diesel engines last?

Over the long haul, newer diesel engines will last 15-20 years in a fleet, while a gasoline engine may need to be replaced once or even twice during the life of a school bus. “All of these are important for fleet managers to stop and consider when choosing a new school bus,” says Hedgecock.



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Some alternatively fueled engines like propane or gasoline may need to be replaced two to three times during the normal lifecycle of a school bus. Clean-diesel engines, on the other hand, are built to last 15-20 years.

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The average 40foot bus is a 9L engine with 280hp. That same engine in a truck would be rated 325-400hp.

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When specifying engines for your buses, you will notice that the engine rating has two numbers: horsepower (200, 220, 240, 260 etc.) and torque (520, 540, 600, 660 etc.). While these are related to one another, various applications have different needs in terms of the power or torque that are required.

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Period. Why? Diesel is the most fuel-efficient engine type on the market. Diesel outperforms other fuels in operating range.

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  • Diesel is the most fuel-efficient engine type on the market.
  • Diesel offers up to 50% better fuel economy compared to other similar-size gasoline, propane or compressed natural gas engines.**
  • Diesel outperforms other fuels in operating range.
  • Diesel buses have better resale value.
  • Diesel buses are less expensive to buy.


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There are different factors to consider about the lifespan of a school bus – whether it's fueled by diesel or propane autogas. The average lifespan of a school bus is 12 to 15 years.

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In the U.K. London is the best by far in terms of frequency. Cardiff is a mixed bag. Cardiff Bus doesn't give change but at least you can buy a day pass using the app these days.

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