General Motors turned heads with the LZ0 engine because the fuel economy is honestly hard to believe. However, a deep-dive diesel mechanic review shows that buyers need to look past the window sticker before signing the paperwork. Alex from Getty’s Garage put this powertrain through the wringer to see if the engineering actually holds up to real abuse.
The Reality Of Modern Emissions
The emissions system is usually the first thing to cause a headache for diesel owners who spend their time idling in the city. This engine uses a heavy stack of hardware, like the EGR and DPF, that rely on high heat to function properly. As Alex noted, “Driving these engines longer distances is going to get the emissions up to temp.” GM made a smart move by placing the oxidation catalyst closer to the turbo to build heat faster. But he warned that owners who treat this like a grocery-getter instead of a work truck will likely deal with clogged filters sooner rather than later.
A Diesel Mechanic Review Of Leaks
Oil leaks are another reality for the LZ0, specifically around the rear main seal and engine plate. The real problem here isn’t just the leak itself but the labor cost to fix it, since the transmission often has to come out. Then there is the wet rubber oil pump belt located at the back of the engine. Alex admitted, “I personally don’t like it because I think it’s rather light duty for a pickup truck.” He explained that while failures aren’t happening left and right, the design prioritizes packaging over serviceability, which leads to massive repair bills when that belt eventually needs attention.
Oil Consumption And Timing Chains
Drivers should also watch how much oil this engine drinks by design. GM technical documents state that burning a quart every 1,000 miles while towing is acceptable. Alex was blunt about this standard and said, “I strongly disagree with their acceptable rate of oil consumption.” That standard effectively means adding gallons of oil between services could be considered normal. The timing chain adds to the stress because it also sits at the rear. He pointed out that in order to change or replace the timing chain, this transmission has to be removed.
The Mechanic’s Final Verdict
The LZ0 is a complex machine that demands an owner who pays attention to maintenance. It offers range and torque that gas engines just can’t match. After a thorough diesel mechanic review from Alex, he summed up his stance and said, “I think it’s the best engine they sell right now, currently.” It is not perfect, but for those who actually tow heavy loads, it is likely the most capable tool in the GM lineup.
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