A sheriff in California has issued a stark warning about the rising prevalence of the “oil-in-the-engine” car-buying scam, which preys on unsuspecting buyers by concealing vehicle damage with deceptive tactics. Two men from California were recently arrested in connection with this scheme, highlighting a surge in such frauds that authorities say is escalating rapidly. This development underscores the need for vigilance in used car transactions, with experts pointing to one major red flag that can expose the con.
The Recent Arrests and Sheriff’s Alert
Riverside County Sheriff Chad Bianco recently announced the arrests of two individuals involved in the “oil-in-the-engine” scam, emphasizing the growing threat it poses to consumers in Southern California. The suspects, 35-year-old John Doe and 42-year-old Jane Smith, both residents of Riverside, California, were apprehended following multiple complaints from victims in late October 2025. Sheriff Bianco highlighted the seriousness of the situation, stating, “This scam is oiling the wheels of crime—buyers need to check under the hood before handing over cash,” indicating a shift from isolated incidents to a more coordinated operation.
The arrests underscore a broader trend of increasing fraud in the used car market, particularly in Southern California. The sheriff’s alert serves as a critical reminder for potential car buyers to exercise caution and conduct thorough inspections before making a purchase. The rise in such scams has prompted law enforcement to intensify efforts to protect consumers and bring perpetrators to justice.
How the ‘Oil-in-the-Engine’ Scam Operates
The “oil-in-the-engine” scam primarily targets online marketplaces like Craigslist, where scammers advertise high-mileage vehicles at suspiciously low prices to attract budget-conscious buyers. During test drives, fraudsters pour oil or other fluids into the engine to temporarily mask noises from worn-out components, creating the illusion of a well-maintained car. This deceptive tactic has been detailed in recent victim accounts from Riverside County, where buyers were left with significant repair bills shortly after purchase.
Once the sale is completed, the temporary fix quickly fails, leaving buyers with repair costs that often exceed $5,000. This pattern has emerged in over 20 cases investigated since early 2025, highlighting the financial risks associated with falling victim to such scams. The prevalence of these fraudulent activities has raised concerns among consumers and authorities alike, prompting calls for increased awareness and preventive measures.
Key Red Flags and Prevention Tips
One of the most significant red flags in identifying this scam is an engine that runs unusually quietly during a short test drive but shows signs of excessive smoke or leaks upon closer inspection. Authorities now urge all buyers to watch for these telltale signs amid the scam’s rise. To prevent falling victim to such schemes, Sheriff Bianco recommends insisting on a pre-purchase inspection by a certified mechanic, a step that could have prevented losses in the cases linked to the arrested suspects.
Compared to prior years, reports from 2025 indicate a 150% increase in similar scams statewide. This alarming trend has prompted new advisories from the California DMV, urging consumers to verify seller credentials through official VIN checks before finalizing any deal. By taking these precautions, buyers can better protect themselves from fraudulent sellers and avoid costly repairs down the line.
For more detailed information on this issue, you can read the full report on Moneywise.
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Grant Mercer covers market dynamics, business trends, and the economic forces driving growth across industries. His analysis connects macro movements with real-world implications for investors, entrepreneurs, and professionals. Through his work at The Daily Overview, Grant helps readers understand how markets function and where opportunities may emerge.
