General Motors unveiled the refreshed 2025 Chevy Tahoe and refreshed 2025 Chevy Suburban late last month, debuting a long list of important updates and changes compared to the preceding 2024 model year. Among the updates was the introduction of a new diesel engine for the Tahoe / Suburban lineup. Critically, the new diesel powerplant will be available for the off-road-oriented Z71 trim level for both full-size SUV nameplates.
For those readers who may be unaware, the fifth-gen Chevy Tahoe and twelfth-gen Chevy Suburban, both of which first hit primetime in conjunction with the 2021 model year, did not previously offer a diesel engine option for the Z71 trim level. The diesel engine offered prior to the latest 2025 model-year refresh was the 3.0L I6 LM2 turbo-diesel Duramax, which was available on every trim level except Z71.
Per a GM Authority exclusive, the reason behind the decision not to offer the 3.0L I6 LM2 in conjunction with Z71 units came down to the off-road trim level’s unique front fascia, which features a higher approach angle that, according to Chevy engineers, obstructs the LM2 intercooler piping.
Luckily, this is no longer an issue for the 2025 Chevy Tahoe and 2025 Chevy Suburban, both of which will offer the new 3.0L I6 LZ0 turbodiesel Duramax engine in conjunction with the Z71 trim level. Compared to the outgoing LM2, the LZ0 produces more power and more torque, rated at 305 horsepower and 495 pound-feet, an improvement of 10 percent and 7.6 percent, respectively.
That said, it should be noted that the LZ0 diesel engine will not be available until the 2025 calendar year. Until then, both refreshed SUVs will only be available with either of the two gasoline engine options, specifically the naturally aspirated 5.3L V8 L84 and the naturally aspirated 6.2L V8 L87.
Even so, diesel fans who enjoy the occasional romp in the dirt will no doubt rejoice at the thought of the new LZ0 under the hood of the refreshed 2025 Chevy Tahoe Z71 or 2025 Chevy Suburban Z71.