We researched and compared the top pre oilers for engines based on manufacturer specifications, published industry standards, and aggregated owner feedback. A pre oiler pressurizes the oil system before startup, reducing dry-start wear on bearings, turbochargers, and valvetrains. In our evaluation, we considered flow rate, pressure regulation, ease of installation, durability of materials, and real-world owner experiences. Below are our findings, presented with honest limitations for each product. Note: We did not physically test these products; our analysis is based on available data and user reports.
| Photo | Product | Score | Buy |
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Accusump Racing Pre Oiler Best Overall 3-quart capacity, electric solenoid valve, anodized aluminum body |
9 | 🛒 Check Price |
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Moroso Oil Accumulator Runner Up 2-quart capacity, manual ball valve, steel body with epoxy finish |
8.7 | 🛒 Check Price |
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Precision Turbo Pre Oiler Best for Turbos Electric pump, inline filter, pressure switch, 1-liter reservoir |
8.4 | 🛒 Check Price |
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Mocal Oil Accumulator Kit Best Value 1.5-quart capacity, manual valve, aluminum body, includes all hoses and fittings |
8.1 | 🛒 Check Price |
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Canton Racing Products Oil Accumulator High Capacity 4-quart capacity, manual valve, steel body, heavy-duty construction |
7.8 | 🛒 Check Price |
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Lubrication Research Pre Oiler Compact Design Electric pump, 0.5-liter reservoir, push-button activation, compact size |
7.5 | 🛒 Check Price |
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Diesel Care Pre Oiler For Diesel Engines Electric pump, 1-liter reservoir, heavy-duty wiring, pressure gauge |
7.3 | 🛒 Check Price |
1. Accusump Racing Pre Oiler: Best Overall
The Accusump Racing Pre Oiler is a staple in motorsport and high-performance circles. Its 3-quart capacity stores pressurized oil that is released before startup, ensuring immediate lubrication. In our evaluation, the anodized aluminum body and electric solenoid valve offer reliable performance and safety. Based on owner feedback, the system works well for engines with high oil pressure demands, such as turbocharged or race engines. However, installation is not for the faint of heart: it requires welding or custom fabrication for the mounting bracket, and the solenoid wiring needs careful routing. This product is best for enthusiasts who track their cars or own high-performance vehicles. If you have a daily driver and want simple installation, consider a simpler electric pre-oiler instead.
- Provides immediate oil pressure on startup via stored pressurized oil
- Electric solenoid valve allows automatic or manual activation
- Anodized aluminum construction resists corrosion and withstands high pressure
Pros: Proven design used in racing for decades; Large oil capacity for extended protection
Cons: Installation requires welding or custom mounting bracket; Higher upfront investment compared to simpler systems
2. Moroso Oil Accumulator: Runner Up
The Moroso Oil Accumulator is a manual pre-oiler that relies on a ball valve. Before starting, you open the valve to let pressurized oil into the engine, then close it after startup. In our research, the steel body and epoxy finish offer good durability, and the 2-quart capacity provides adequate protection for most street and strip applications. Based on owner feedback, it is easy to install and maintain. However, the manual operation is a drawback: forgetting to open the valve provides no protection, and forgetting to close it can cause continuous oil bleed. This pre-oiler is ideal for racers who are accustomed to pre-flight checks. For daily drivers, an automatic system is more convenient.
- Manual ball valve for simple, reliable operation
- Steel body with epoxy coating for durability
- Compact size fits in tight engine bays
Pros: Affordable alternative to electric systems; Durable steel construction
Cons: Manual valve requires driver to remember to open/close; Smaller capacity may not suffice for very large engines
3. Precision Turbo Pre Oiler: Best for Turbos
Precision Turbo’s Pre Oiler targets turbocharged engines, where dry starts can quickly damage turbo bearings. It uses an electric pump to circulate oil through the turbo before the engine fires. In our evaluation, the inline filter and pressure switch add safety and convenience. Based on owner feedback, the system is effective at reducing turbo wear, but the 1-liter reservoir is small; for engines with large oil capacity, you may need to refill after several starts. Also, some users report the pump is audible. This is a great choice for turbo owners who want automatic protection. If you have a naturally aspirated engine, a simpler accumulator may suffice.
- Electric pump pre-lubricates turbo bearings before engine start
- Inline filter prevents debris from entering oil system
- Pressure switch automatically shuts off pump when oil pressure rises
Pros: Specifically designed for turbocharged engines; Automatic operation with pressure switch
Cons: Small reservoir may need frequent refills for large engines; Pump can be noisy during operation
4. Mocal Oil Accumulator Kit: Best Value
The Mocal Oil Accumulator Kit is a budget-friendly pre-oiler that includes everything needed for installation. Its 1.5-quart aluminum body is lightweight and resists corrosion. In our research, the kit offers good value for those willing to use a manual valve. Based on owner feedback, the included hoses are of decent quality, but some users replaced them with braided lines for added durability. The manual valve is a limitation: it is easy to forget. This kit is best for budget-conscious DIYers with smaller engines. For those wanting automatic operation, consider an electric system.
- Complete kit with hoses and fittings for easy installation
- Lightweight aluminum body
- Manual valve for simple operation
Pros: Good value for a complete system; Lightweight and compact
Cons: Manual valve requires driver attention; Smaller capacity may not suit high-performance engines
5. Canton Racing Products Oil Accumulator: High Capacity
The Canton Racing Oil Accumulator offers the largest capacity in our review at 4 quarts. This makes it suitable for big-block engines or vehicles that experience long periods of inactivity. In our evaluation, the steel body and powder coat finish are durable. However, its size and weight (over 10 pounds when full) can be a challenge to mount securely. Based on owner feedback, the manual valve is straightforward but requires discipline. This product is best for dedicated race cars with ample space. For street cars with limited room, a smaller unit is more practical.
- Large 4-quart capacity for extended engine protection
- Heavy-duty steel body with powder coat finish
- Manual ball valve with remote mount option
Pros: High oil capacity for large engines; Rugged construction
Cons: Large size may be difficult to mount in tight spaces; Manual operation and heavy weight
6. Lubrication Research Pre Oiler: Compact Design
The Lubrication Research Pre Oiler is a compact electric system designed for easy installation in tight spaces. It uses a push-button to activate a pump that sends oil from a 0.5-liter reservoir to the engine. In our research, its small size is a pro for tight engine bays but a con for protection: it only provides a few seconds of pre-lube. Based on owner feedback, the plastic housing and fittings may degrade under high underhood temperatures. This product is best for small engines or as a supplementary system. For serious protection, a larger accumulator is recommended.
- Small footprint fits in tight engine bays
- Push-button electric operation for convenience
- Includes check valve to prevent drain back
Pros: Very compact and easy to install; Electric operation with simple push button
Cons: Very small reservoir limits protection to short startups; Plastic components may not withstand high heat
7. Diesel Care Pre Oiler: For Diesel Engines
The Diesel Care Pre Oiler targets diesel engines, which often have higher oil pressure and larger oil capacity. Its electric pump and 1-liter reservoir aim to provide pre-lubrication before cold starts. In our evaluation, the heavy-duty wiring and pressure gauge are good features. However, based on owner feedback, the installation is more involved than simpler accumulator systems, and the reservoir may need frequent refills for big diesels. This pre-oiler is best for diesel truck owners who want automatic protection. For gasoline engines, other options may be simpler.
- Designed for diesel engines with higher oil pressure needs
- Includes pressure gauge to monitor system
- Heavy-duty wiring harness for reliability
Pros: Specifically designed for diesel applications; Pressure gauge adds monitoring capability
Cons: Installation can be complex due to wiring; Reservoir size may be insufficient for large diesel engines
Frequently Asked Questions
How does a pre oiler work?
A pre oiler stores pressurized oil or uses an electric pump to circulate oil through the engine before startup. This prevents metal-to-metal contact during the critical first seconds when oil pressure is building. Accumulator types use a pressurized tank; electric types use a pump to push oil from a reservoir.
Do I need a pre oiler for my daily driver?
For most daily drivers with short oil change intervals, a pre oiler is not essential. However, if you have a turbocharged engine, a high-performance build, or frequently start your engine in cold weather, a pre oiler can significantly reduce wear. It is also beneficial for engines that sit for long periods.
Can a pre oiler damage my engine?
If installed incorrectly or if the system fails (e.g., a stuck valve), a pre oiler could potentially cause issues like oil leaks or over-pressurization. However, reputable systems include safety features such as pressure switches and check valves. Proper installation and maintenance are key.
How much oil does a pre oiler need?
Reservoir or accumulator capacities range from 0.5 to 4 quarts. For most passenger cars, 1-2 quarts is sufficient to pre-lubricate the engine. Larger engines or those with high oil capacity may benefit from larger accumulators. Always follow the manufacturer’s recommendation.
Can I install a pre oiler myself?
Many pre oilers are DIY-friendly, especially manual accumulator kits that simply tee into the oil system. Electric systems require wiring and may need more expertise. If you are not comfortable with automotive modifications, professional installation is recommended to avoid oil leaks or electrical issues.
Our Verdict
After researching and comparing the top pre oilers, our top pick is the Accusump Racing Pre Oiler for its proven design, large capacity, and automatic electric solenoid. It offers the best balance of performance and durability for serious enthusiasts. The runner up is the Moroso Oil Accumulator, which provides reliable manual protection at a lower cost, making it a great choice for racers who prefer simplicity. Choose based on your engine type, installation preferences, and budget.
