BY Charles Jackson
Mounting Scrutiny Over Oil Consumption in Hyundai and Kia Vehicles as Owner Complaints Persist
Hyundai and Kia continue to face regulatory scrutiny, class-action litigation, and consumer complaints tied to excessive oil consumption in a range of gasoline direct injection (GDI) engines produced primarily between 2011 and 2021. The issue—frequently traced to carbon-stuck piston oil rings—has been widely documented in legal filings, federal safety investigations, service bulletins, and social media forums.
Engines and Models Under Review
The most commonly cited engines include the Theta II (2.0L and 2.4L), Nu (2.0L), and Gamma (1.6L) GDI platforms. Affected models span much of both automakers’ lineups, including the Hyundai Sonata, Santa Fe, and Tucson, as well as the Kia Optima, Sorento, Soul, and Sportage.
When piston rings fail to properly scrape oil from the cylinder walls, oil enters the combustion chamber and burns. Owners report symptoms including frequent low-oil warnings, engine knocking, stalling, loss of power, excessive exhaust smoke, and in some cases, vehicle fires. Manufacturer service bulletins typically define “excessive consumption” as more than one quart of oil per 1,000 miles—a threshold that can trigger diagnostic procedures or engine replacement under certain warranty programs.
Recalls and Legal Settlements
In 2025, Kia recalled more than 137,000 2021–2023 Seltos and Soul vehicles due to defective piston oil rings that could increase oil consumption and pose a fire risk. The recall followed years of engine-related campaigns and settlements involving earlier GDI engines.
In 2024, a major settlement expanded coverage to approximately 2.1 million additional vehicles equipped with the 1.6L Gamma GDI engine. Under the agreement, qualifying owners received an extended powertrain warranty of 15 years or 150,000 miles, covering inspections and repairs related to connecting rod bearing failure—a condition that can follow prolonged oil starvation.
To qualify for this extended coverage, owners must complete a free Knock Sensor Detection System (KSDS) software update at an authorized dealership. The KSDS is designed to detect early signs of bearing wear and protect the engine from catastrophic failure. Failure to obtain the update can void eligibility for certain warranty claims.
Owners are typically required to undergo a formal oil consumption test and maintain documented oil change records. Missing oil changes for extended intervals—often defined as 15,000 miles or one year—may disqualify claims under manufacturer policy.
Owner Experience Raises Additional Concerns
Beyond the broader litigation landscape, some owners report additional challenges at the dealership level.
In one case, a lessee attempted to return a Hyundai vehicle at the end of a three-year lease at South Bay Hyundai in Torrance after the originating dealership closed. Despite being within the mileage terms, the dealer allegedly refused to accept the return without a $1,000 payment. The lessee ultimately purchased the vehicle.
In 2024, the vehicle’s check engine light illuminated. South Bay Hyundai reportedly cleared the diagnostic code without performing substantive repairs. Weeks later, the issue returned. A second dealership, Hyundai of Carson, also cleared the light. On a subsequent visit, a service advisor attributed the problem to a “damaged canister,” quoting approximately $1,500 for replacement. The owner, who had an active warranty, reports that the warranty company denied the claim because the dealer characterized the part as physically damaged rather than defective.
The owner then sought independent repair. The canister was replaced, and the removed component reportedly showed no physical damage beyond normal wear. However, replacing the part did not resolve the underlying issue. The check engine light returned, and the vehicle began exhibiting more severe symptoms: engine shutdowns, excessive oil burning, and fumes entering the cabin.
Broader Implications
Consumer complaints filed with federal regulators and posted across automotive forums frequently describe similar patterns: repeated check engine light resets, oil consumption monitoring procedures, and disputed warranty claims. Legal settlements have provided engine replacements and extended warranties for millions of vehicles, yet some owners continue to report difficulty obtaining definitive repairs.
As Hyundai and Kia implement recalls, software updates, and settlement remedies, affected drivers are advised to check their VIN on the manufacturer’s recall website, confirm completion of the KSDS update where applicable, document oil consumption carefully, and retain all maintenance records.
With millions of vehicles covered under extended warranty programs, the issue remains one of the most significant engine-related consumer controversies in the modern automotive sector.
Story: Charles Jackson
