Research from the database
Original analysis of NHTSA owner complaint and recall data, focused on the patterns that matter when you're buying, selling, or maintaining a used vehicle.
The GM 3.6 V6 Timing Chain
The Theta II got the headlines and the class action. GM's 3.6L LFX/LLT V6 — the only engine in the Lambda crossovers (Traverse, Acadia, Enclave, Outlook) — throws the same P0008/P0009 timing-chain-stretch code around 90,000 miles, and never got a recall for it. The engine-complaint record, isolated to the platforms where a complaint can only mean the V6.
A Honda Engine Problem That Depends on the Weather
In Texas nobody talks about the Honda 1.5T. In Minnesota the dealer cut your oil-change interval in half. The L15B7 turbo drops fuel in the oil pan on cold-start, short-trip driving — and on the 2017 CR-V the median complaint mileage was 14,000. Where it hits, and why the same engine looks different in different ZIP codes.
A Recall Covers One Defect. It Is Not a Clean Bill of Health.
A recall is one defect the manufacturer was forced to fix; it is not a verdict on the whole car. Here are widely-driven vehicle systems owners complain about by the hundreds with no recall for that system — each one cross-checked against the live NHTSA recall record.
The Theta II Decade
A decade of Hyundai and Kia Theta II rod-bearing failure plotted by model year against the recall timeline that chased it. 2013 was the worst year. 2019 brought a software band-aid. 2020 brought a settlement. The cars are still on the road.
Tires Before Engines
Owners report each vehicle system failing at very different odometer readings. We pulled 308,855 owner-reported mileages across 7,634 NHTSA problem clusters and aggregated by component category. Tires cluster near 30,000 miles. Engines and suspension at 70,000. The maintenance roadmap on a used car looks nothing like buyers assume.
Not All CVTs Are Equal
They're both called "CVT," but the NHTSA record splits them cleanly. Nissan's belt-and-pulley unit draws about 6.5 times the powertrain complaints per model-year of Toyota's planetary eCVT, with failures clustering around 82,000 miles. The belt is the difference.
When Things Break, in Actual Miles
For decades, "at what mileage will it fail?" was a guess. NHTSA's mileage field is now populated in our database, so we plotted ten famous engine and transmission failures by when owners actually filed. Some hit at 14,000 miles. Some hold until 90,000.
The Ford Transmission Nobody Recalled
Everyone knows the Ford PowerShift. Almost nobody talks about the 6F35, which quietly accumulated four times the NHTSA owner complaints at a comparable per-car failure rate. One got a $35M settlement. The other got a software flash.
7% of Vehicles, 39% of Complaints
When you actually count up the NHTSA owner complaints filed against the engines and transmissions everybody in the shop world already knows are problems, how big is that pile? We pulled the data and counted.