Why cars and trucks equipped with Chevrolet’s new production V8s won’t have an engine oil dipstick

Among the oldest engines still in production today is the Chevy small-block (SBC) V8, and you may have heard that GM recently pulled the covers off the latest additions to the sixth-generation family – the 5.7-liter L76 and the 6.6-liter L78. While the big numbers of more horsepower and capacity are all exciting news, the fact that these engines no longer come with the good old gauge might be a little disappointing for ardent GM fans.

Although GM is not the first company to abandon gauges, many enthusiasts consider it an unnecessary complication in engine maintenance. However, that’s not exactly how Ian Stahl, deputy chief engineer of small-block engines at GM, feels about the idea. Speaking to The Fast Lane Truck on YouTube, Stahl reportedly said: “I was never a fan of it.” He compares this whole oil dipstick thing to the number of people who didn’t like seat belts in the past. “Now, no one thinks twice about it (seat belts)… so it takes time to get used to it,” according to Stahl.

Perhaps his reasoning that few owners check the oil or know how to check it properly may hold water, but aside from that, engine packaging and other design considerations also played a role in the decision to abandon the traditional setup. Instead, you find a bank of sensors that rely on a number of parameters, including driving time, temperature and miles traveled, to check oil pressure, oil level and oil life.

While the comments section of the video didn’t spare Stahl or his remarks, it’s worth noting that these sixth-generation small blocks bring several noteworthy upgrades over the outgoing 5.3 and 6.2 versions.

Before we get into the details, it’s important to understand that these new 5.7 and 6.6 V8s aren’t the first sixth-generation engines to arrive. That honor goes to the 2027 Corvette’s 6.7-liter LS6 engine. What’s interesting, however, is that, according to GM Authority, unlike the latest sixth-generation small blocks, the LS6 has an oil dipstick. Remember, these 5.7 and 6.6 are for the latest generation of GM light trucks. Comparing the 6.7 LS6 to the 6.6 L78, engineers told Car and Driver that the LS6, in addition to its slightly larger displacement, featured hardware changes that wouldn’t have made sense for trucks. Plus, the LS6 is dry sump, so make of that what you will.

Gauge controversy aside, the 5.7-liter L76 V8 makes 402 horsepower and 428 pound-feet of torque, which is significantly more than the 5.3’s 355 horsepower and 383 torque. As for the 6.6-liter L78, the V8 develops 481 horsepower and 501 pound-feet of torque, numbers that make the outgoing 6.2’s 420 horsepower and 460 lb-ft far less impressive. Increasing the stroke length by 6mm helped the engines produce more power and torque, as did the use of larger throttle bodies, new intake manifolds and increased compression ratios. The combination of portable and direct fuel injection is another highlight of the sixth generation, as well as the introduction of a new lubrication system.

While GM has taken the unconventional route for its latest V8 trucks, that’s not the case with the 3.0-liter Duramax inline-6 ​​diesel and the 2.7-liter TurboMax inline-four. These engines continue with the traditional oil dipstick. And if it makes you feel any better, the Ram 1500’s 3.0-liter twin-turbo inline-6 ​​is also gaugeless.