Choosing the right engine oil is crucial for your car’s health, but not all oils are created equal. In fact, some are simply bad. We’ve done the research for you and are exposing the 15 worst brands on the market.

Our guide cuts through the marketing hype to reveal which oils fail to protect your engine and could even lead to damage. Armed with this information, you can make informed decisions and avoid the costly mistake of settling for subpar oil.

Mileage 365 Lubricants

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Mileage 365 Lubricants fails to uphold industry-standard quality, lacking essential additives that prevent engine wear and tear. Its performance in cold temperatures is suboptimal, failing to offer the necessary protection for engines.

The presence of silicon, copper, and aluminum suggests the inclusion of used or abrasive materials, which can cause significant damage to engine components.

Sgt. P Motor Oil

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Sgt. P Motor Oil falls short in meeting essential viscosity requirements across various temperatures, indicating poor performance and potential risk to engine health. The oil contains an excess of harmful additives while lacking beneficial ones like phosphorus, necessary for engine protection.

Such imbalances make Sgt. P Motor Oil detrimental to engine performance and longevity.

Super Green Smokeless Motor Oil

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Super Green Smokeless Motor Oil lacks transparency in labeling, providing little to no information about compliance with industry standards. Its viscosity is notably inadequate in colder temperatures, risking engine functionality and reliability in lower weather conditions.

High levels of phosphorus in this oil pose a threat to catalytic converters, potentially increasing tailpipe emissions contrary to what its name might suggest.

Lube 1 Oil

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Lube 1 Oil is explicitly unsuitable for modern engines, a fact that is somewhat obscured in its packaging, hinting at compatibility with SJ category motor oils meant for pre-2002 vehicles.

Its inadequate viscosity levels and the presence of high contaminant content, including possible used oil, further disqualify it from use in contemporary engines.

Petrola Motor Oil

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Despite its front label claim of being ‘premium,’ Petrola Motor Oil reveals its unsuitability for modern engines on the back, stating it has not been rated by the API and is inappropriate for vehicles manufactured after 1930.

The absence of engine-protecting additives and the unusual presence of iron contaminants raise serious concerns about its potential to damage engine components.

AB Lubes Supertech

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AB Lubes Supertech is notably deficient in meeting any recognized automotive oil standards, which is a critical flaw. Its viscosity decreases significantly with temperature rise, reducing its effectiveness in engine lubrication.

The product’s packaging itself cautions users about its non-compliance with industry specifications, signaling potential risks to engine performance and longevity.

Cruz-In

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Cruz-In engine oil is marked by its failure to adhere to any established automotive standards, with a viscosity level too low for safe engine operation. The presence of high silicon content suggests the inclusion of abrasive materials, posing a serious risk of engine damage.

The Petroleum Quality Institute of America (PQIA) has issued warnings against Cruz-In oils, reflecting the product’s unsuitability for modern vehicles.

Petrola Motor Oil

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Petrola Motor Oil, designed for pre-1930 vehicles, fails to meet modern standards and ignores current Federal Trade Commission labeling requirements. Its formulation lacks necessary additives, and its high volatility compromises engine performance and longevity.

Misleading labels present incorrect viscosity levels, risking engine health. The product’s environmental impact is negative, with increased fuel consumption being a significant drawback.

Petrola’s inability to adapt to contemporary automotive needs, coupled with deceptive marketing practices, makes it a poor choice for today’s engines.

Xcel Motor Oil

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Xcel Motor Oil has earned a notorious reputation, with legal actions labeling it as detrimental to vehicles. Its low price is overshadowed by the subpar quality and lack of essential additives, leading to costly engine repairs.

This brand fails to align with the technological advancements required for modern vehicles, offering neither the quality nor the performance needed. Xcel’s misleading marketing and insufficient product standards result in a lubricant that falls short in protecting against friction and wear.

Q10-40 Motor Oil

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Q10-40 Motor Oil is deficient in necessary additives and detergents, compromising engine protection and cleanliness. Its poor viscosity index leads to oil degradation and contamination at high temperatures, directly contributing to increased friction and engine wear.

The brand’s claims do not align with the actual performance, as users experience accelerated engine deterioration. The insufficient additive content fails to safeguard against corrosion, making Q10-40 Motor Oil a detrimental choice for engine longevity and efficiency.

Quaker State Q Motor Oil

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Quaker State Q Motor Oil disappoints with its high-cost, low-quality product. It exhibits high volatility, leading to rapid consumption and necessitating frequent oil changes. The oil lacks the necessary additives for effective engine lubrication and smooth operation.

Despite its premium pricing, Quaker State Q falls short in delivering the basic advantages of motor oil, misleading consumers with inaccurate labeling and unfounded performance claims. Its inability to maintain consistent viscosity further detracts from its reliability.

Questron Motor Oil

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Questron Motor Oil’s claims of “premium quality” are misleading, as their products lack proper certification from both API and SAE. This brand’s motor oils have low viscosity levels, leading to inadequate engine lubrication and increased noise.

Despite promising various benefits, Questron fails to deliver on these claims, often resulting in negative user experiences. The oil’s high volatility and ill-defined viscosity contribute to poor engine performance and potential damage.

Given its track record of subpar results and false advertising, Questron Motor Oil is not recommended for modern vehicles seeking reliable and effective engine maintenance.

Bullseye Motor Oil

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Bullseye Motor Oil may catch the eye with its attractive packaging, but it falls short in performance. The oil’s thin consistency fails to provide adequate lubrication, leading to the risk of sludge buildup and engine damage.

Customer feedback consistently points to disappointment, highlighting the disparity between the product’s appearance and its actual quality.

Bullseye’s formula contains insufficient additives, compromising the engine’s protection. The brand’s misrepresentative marketing and failure to meet basic lubrication standards make it a poor choice for any vehicle.

Liberty Motor Oil

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Liberty Motor Oil falls short due to its inadequate additives and low viscosity index, failing to maintain engine lubrication under high temperatures. This brand is known for its quick evaporation rate, leading to frequent top-ups and potential engine damage.

Despite claims of high-performance viscosity levels, actual measurements show disappointing figures below 70%.

Liberty Motor Oil’s higher volatility exacerbates its inefficiency, making it a poor choice for long-term engine maintenance. The brand’s inability to meet basic motor oil requirements further underscores its unreliability and lack of value for consumers.

Xpress Lube Pro Motor Oil

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Xpress Lube Pro Motor Oil lacks American Petroleum Institute (API) approval, signaling major concerns about its quality. The oil is not only of low grade but is also contaminated with impurities and detrimental additives that can clog engine components.

Its failure to provide essential information like SAE and viscosity grades undermines its credibility and utility in modern vehicles.

The presence of unnecessary contaminants degrades the oil’s quality further, making it unsuitable for both new and old car models. Xpress Lube Pro’s misleading labeling and unmet promises place it among the least recommended motor oils on the market.

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Author: Abbie Clark

Title: Co-Founder

Expertise: Automotive Industry, Electric Vehicles, DIY Car Repairs

Bio:

Abbie Clark is a writer, blog, and founder of RideRambler, Hey She Thrives, and The Bearded Bunch.

From clever car cleaning tricks to the freshest car features and reviews, Abbie loves sharing her knowledge on everything automotive. Outside of her time writing for her websites, you’ll find her fishing with her husband, deciphering her toddler’s babbling, or baking up something sweet.

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