What's the difference between Volvo S60 T4 and B4?

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The differences between the Volvo S60 T4 and B4 series are as follows: Driving experience: Compared to the T4, the B4 series starts more smoothly. The 2022 model also removed the auto start-stop switch button, so it cannot be manually turned off. During vehicle startup, the motor's intervention ensures the engine reaches the required starting speed before ignition, making the startup vibration almost imperceptible and not affecting the driving experience. In this regard, the B4 engine has an advantage. However, in rainy weather, especially on waterlogged roads, it's advisable to avoid wading through deep water with the 2022 model to prevent the risk of stalling and restarting. Fuel consumption: The B4 series has slightly lower fuel consumption compared to the T4, mainly due to the benefits of the auto start-stop function, but the difference is not significant, and fuel efficiency is essentially comparable. Power: There are minimal differences in other aspects between the two engines, with nearly identical power parameters. Both the T-series and B-series engines are mature Volvo engines, and as long as there are no major defects during use, they are considered excellent engines.