Understanding Engine Break In | Dos and Don'ts

Summary

This video dispels myths about engine break-in for new cars, emphasizing the importance of varying load and avoiding thermal shock. It explains that mass-produced engines need less break-in than high-performance ones, which require careful treatment. The script advises against constant RPM and suggests gradual thermal cycling for the first 200-300 miles. It also discusses oil types, highlighting the differences between conventional and eco oils, and their impact on engine performance, especially in high-temperature conditions.

Takeaways

• 🚗 The necessity of engine break-in varies based on the type of engine and its intended use.
• 🏭 Commodity engines designed for mass production require less break-in as they are built for immediate use.
• 🏎 High-performance engines, like those in sports cars, need more careful treatment during the break-in period.
• ❌ A common myth is that manufacturers fully break in high-performance engines in the factory, which is often not the case.
• 🔧 Modern engine design and manufacturing allow for more flexibility in how engines are broken in compared to 20 years ago.
• 🛣️ For new engines, avoid constant RPM and thermal shock; vary load and speed to ensure even wear.
• 🚫 Avoid high RPM ranges when the engine is new to prevent thermal stress on engine components.
• 🔧 The break-in process is crucial for engine bearings to adjust, wear in, and maintain an oil film for protection.
• 🔥 Thermal cycling is important for all moving parts of a car, not just the engine, to prevent premature wear.
• 🛠️ Regular cars also benefit from a gradual break-in process to ensure even wear and to protect other moving parts like transmissions and brakes.
• 🛢️ Oil choice is crucial during the break-in period; follow manufacturer recommendations and consider oil type for high-performance use.

Q & A

What is the main topic discussed in the video?

The main topic of the video is the break-in process for new car engines, including different methods and considerations depending on the type of engine and vehicle.

What are some common misconceptions about engine break-in?

Common misconceptions include the belief that you should either drive a new car hard right away or be extremely gentle with it for an extended period. The video clarifies that the ideal approach lies somewhere in between these extremes.

How does engine type influence the break-in process?

The break-in process varies based on the engine type. Mass-produced engines, like those in a CRV or Chevy Malibu, require minimal break-in, while high-performance engines, such as those in a Ferrari or Porsche GT3, require a more careful break-in to ensure optimal performance and longevity.

Do manufacturers break in high-performance engines at the factory?

No, most high-performance engines are not extensively broken in at the factory. Some engines might undergo a short test for quality control, including RPM sweeps and checks for leaks, but this is not a full break-in process.

What is the recommended method for breaking in a new car engine?

The recommended method involves varying the engine load, avoiding constant RPMs for extended periods, and not pushing the engine to extreme high temperatures or RPMs. This approach allows the moving parts to adjust and wear evenly, ensuring a proper break-in.

Why is it important to vary engine load during the break-in process?

Varying engine load helps to avoid creating high spots on the engine's moving parts, allowing them to wear evenly and ensuring that the oil film remains intact between the moving surfaces, which is crucial for engine longevity.

What role does modern oil quality play in the engine break-in process?

Modern oils are more stable and durable than oils from 20 years ago, allowing for more flexibility in how a new engine is treated. However, even with modern oils, it is still important to follow recommended break-in practices to ensure optimal engine performance and longevity.

What are some specific things to avoid during the engine break-in period?

During the break-in period, you should avoid maintaining a constant RPM for long periods, high RPMs or redlining, and thermal shock from rapid heating and cooling cycles. It’s also advised not to drive the car aggressively on a race track immediately.

How does thermal shock affect engine components during break-in?

Thermal shock, which occurs when engine components rapidly heat up and then cool down, can cause uneven wear and damage to the engine's moving parts. This is especially detrimental during the break-in period when components are still adjusting.

How should you handle oil changes for a new engine during the break-in period?

For a new engine, it's often recommended to change the oil after the first 1,000 miles to remove any contaminants from the assembly process. After this initial change, you can typically follow the manufacturer's recommended oil change intervals.

What are the differences between 'eco oils' and regular oils for high-performance engines?

Eco oils like 0W-20 or 0W-16 are designed for better fuel economy and lower emissions but are not ideal for high-performance engines under extreme conditions. These oils can thin out at high temperatures, leading to pressure loss and potential engine damage.