GM’s 3.6-liter twin-turbo V6 LF4 engine and its tuned-down cousin, the LF3, might have an expiration date in place. Currently, the LF3 is used in the Cadillac CTS V-Sport and Cadillac XTS V-Sport, while the pluckier LF4 is reserved for the more track-oriented Cadillac ATS-V, but all three of those models are set to go out of production over the next 12 to 16 months – possibly sooner.
What, then, of the engines? The GM 3.6-liter twin-turbo V6 LF3 is a peach in its own right, cranking out 410 or 420 peak horsepower, depending on the car, which in the Cadillac CTS V-Sport allows for a 0-to-60-mph sprint in under five seconds. The LF4 is even more impressive, sending up to 464 horses’ worth of thrust to the rear wheels and permitting a 0-to-60 sprint in less than four seconds.
Unfortunately, we don’t expect the LF3 and LF4 to survive the Cadillac car cull; as great as the two twin-turbo V6s are, they’re based on an outmoded engine architecture – one that’s been supplanted by GM’s newer LG family of high-feature V6 engines. Two members of that family – the naturally-aspirated GM 3.6-liter V6 LGX, and the 3.0-liter twin-turbo V6 LGW – have made their way into Cadillac vehicles, and it’s reasonable to suspect that an up-tuned version of the smaller LGW could effectively replace the LF3/LF4 in some Cadillac performance cars.
Despite its smaller displacement, the 3.0L LGW nearly matches the 2018 Cadillac XTS V-Sport‘s LF3 for output, gracing the CT6 with 404 peak horsepower. We suspect it could be tuned to match the Cadillac ATS-V’s 464 horsepower, should GM’s luxury brand seek to replace that model with a CT3-V and/or CT4-V.
In fact, we see little reason for GM to continue producing its twin-turbo LF-family V6 engines after the sun sets on the Cadillac CTS V-Sport, XTS V-Sport, and ATS-V. As for whether there will ever be a twin-turbocharged version of the larger 3.6L LGX, that remains to be seen.
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