Engine oil is a vital part of your car’s performance, and choosing the right one can make all the difference. Unfortunately, some budget oils just don’t meet the standards required for smooth operation long-term. Here’s a list of engine oils that experts and consumers often criticize for their low quality and lack of proper protection. If you care about the longevity of your car’s engine, you might steer clear of these low-tier options.

1. SuperTech (Walmart’s In-House Brand)

SuperTech engine oil is Walmart’s budget brand, often seen as a go-to for drivers looking to save money. While it’s certainly affordable, many mechanics and car experts don’t recommend it for long-term use. SuperTech oils can lack the high-quality additives needed for optimal engine performance, especially under high stress. It’s common to hear complaints about the oil not being as smooth or effective in extreme temperatures.

Why avoid: It’s okay for short-term use, but it may not protect your engine as effectively as higher-end oils. Experts recommend upgrading once you can afford something more premium.

2. Quaker State (Budget Version)

Quaker State is well-known in the automotive world, but when it comes to the lower-end products in its lineup, like the “Advanced Durability” or certain “Economy” versions, it falls short. Experts say these oils can break down quickly, especially in high-mileage vehicles or those that experience heavy driving conditions. Quaker State’s budget options just don’t perform as well as oils from other well-established brands.

Why avoid: You might get through a few thousand miles, but you could face higher wear and tear on the engine down the line. The oil can’t handle extreme conditions, which may lead to unnecessary engine damage.

3. Valvoline Daily Protection (Non-Synthetic)

Valvoline is a name many trust, but experts often label their non-synthetic “Daily Protection” oils as low-quality options. While this oil might get the job done for basic commuting, it may not hold up as well under stress or higher temperatures. It tends to lose its protective properties faster than more premium synthetic oils, making it less reliable for more demanding driving.

Why avoid: If you’re someone who drives often, especially in extreme heat or cold, this oil might not provide the protection your engine needs. Consider stepping up to a full synthetic oil instead.

4. Carquest (Economy Line)

Carquest, a name typically associated with auto parts stores, also offers lower-end engine oils it sells in bulk at discount stores. Along with its relatively cheap price, it’s not known for providing long-lasting protection. This oil can often leave deposits in the engine or fail to prevent wear on critical components. Additionally, it may not maintain its viscosity over time, which is a must-have for consistent engine protection.

Why avoid: It’s designed for short-term, light usage, but if you want to maintain the health of your engine, look elsewhere.

5. Penzoil Conventional Oil (Lower-Tier)

Penzzoil is a well-known name, but their conventional oils are often considered bottom-tier compared to their higher-end offerings. While they may suffice for regular daily driving, conventional oils from Penzoil don’t provide the same advanced protection as their full-synthetic versions. If you’re used to pushing your car’s limits with more demanding driving, you might run into issues with premature wear and deposits.

Why avoid: If you’re driving in tough conditions or if your car has a lot of miles on it, opting for Penzoil’s conventional oil might not provide the long-lasting protection you need.

6. MaxLife by Valvoline (Economy Synthetic Blend)

MaxLife is marketed as an oil for higher-mileage vehicles, but its synthetic blend formula doesn’t quite hold up when compared to other higher-end blends. It’s a bit too thin and doesn’t provide the same level of protection under high-performance conditions. While cheaper than full-synthetic oils, the blend still leaves much desired when it comes to maintaining an older engine.

Why avoid: MaxLife’s synthetic blend is not as durable as it seems and can lead to increased engine wear. If your car has over 100,000 miles, it’s better to go for a stronger full-synthetic option.

7. Royal Purple HPS (Not Always Worth the Premium)

Royal Purple markets its HPS line as a performance oil, but many drivers claim it doesn’t quite justify its price. While it offers some great protection in high-performance applications, the oil isn’t as consistent as other premium options. It can break down too quickly in some engines, especially those that aren’t always driven in extreme conditions.

Why avoid: If you’re not running a high-performance or race car, you’re probably paying more than you need to for questionable quality.

Engine oils are essential to keeping your vehicle running smoothly, and while budget options may seem appealing, they can cost you more in the long run. Oils that don’t meet high standards often fail to protect against engine wear, reduce efficiency, and can even shorten the lifespan of your car. Always check the specifications and reviews before choosing an engine oil, and if possible, invest in a quality full-synthetic option that’ll provide reliable protection for your engine.