GM’s sixth-generation small-block V8s for light-duty trucks remove the traditional oil dipstick in favor of sensor-based monitoring. The company cites packaging, ownership habits, and software-readouts — but some GM engines retain dipsticks.
Engine design and packaging constraints were part of the decision. GM engineers also questioned how reliably owners check oil with a dipstick.
Other recent GM powerplants still use dipsticks (the 6.7L LS6 in the Corvette, and the 3.0L Duramax and 2.7L TurboMax in other models), so the change is vehicle- and application-specific.
The new small-blocks bring performance and hardware upgrades — increased stroke, larger throttle bodies, port + direct injection, new lubrication system — alongside the electronic oil monitoring.
General Motors' latest sixth-generation small-block V8s for light-duty trucks — the 5.7-liter L76 and 6.6-liter L78 — will be produced without a conventional engine oil dipstick. GM's engineering team replaced the manual dipstick check with an array of sensors and an on-screen oil-level readout that factors in parameters such as driving time, temperature, and miles driven.
GM staff framed the change as a mix of practical packaging and ownership factors. Assistant Chief Engineer Ian Stahl said, "I've never been a fan of them," and suggested many owners either don't check oil or do so incorrectly. The motors' under‑hood layout and other design constraints also influenced the decision. The sensor suite continuously monitors oil pressure, oil level, and oil life and reports to the vehicle display rather than relying on manual measurement.
What the new engines bring besides the dipstick change
The dipstick removal comes alongside notable mechanical upgrades. The L76 (5.7L) makes more power and torque than the outgoing 5.3L, and the L78 (6.6L) surpasses the old 6.2L. Engineers lengthened the piston stroke by 6 mm, fitted larger throttle bodies and new intake manifolds, raised compression ratios, and used combined port and direct injection. GM also introduced a new lubrication system for these engines.
Not every recent GM engine dropped the dipstick. The 6.7-liter LS6 that debuted in the 2027 Corvette does include one. Car and Driver noted the LS6 differs in hardware and is dry-sumped, which affected packaging choices and the decision to keep a dipstick. The 3.0-liter straight‑6 Duramax diesel and the 2.7‑liter TurboMax inline-four continue with traditional dipsticks for their designs and applications.
If you buy a truck with the new 5.7L or 6.6L small-block, oil level and alerts will be delivered via in-cabin displays rather than a manual stick. The system is designed to warn drivers when oil is low or overfilled and to calculate how much to add, claims derived reporting. That readout aims to reduce human error inherent in manual checks, and it ties into broader software-driven monitoring and over-the-air update strategies GM is using on recent trucks.
How this compares across manufacturers
Eliminating the dipstick is not unique to GM. Other brands have already introduced dipstick-free engines in some vehicles. The approach tends to show up where packaging, electronic systems, and ownership models align with a push toward centralized vehicle monitoring.
The dipstick's removal on GM's new truck V8s is a deliberate engineering and ownership decision tied to engine packaging and sensor-based monitoring. The change arrives alongside genuine performance and hardware updates to the small-block family. Several GM engines retain dipsticks, so whether a dipstick is present depends on the engine architecture and the vehicle's intended use.
The dashboard system can warn drivers when oil is low or overfilled, while several other GM engines will keep traditional dipsticks
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