A new engine is like a pair of boots: you have to break it in gradually. At least, that’s the conventional wisdom shared by most of the auto industry. But technological and manufacturing advances have many wondering if you still need to gently break in a new engine for the first few hundred miles before shutting it down completely. The truth is, it depends.
Why break in a new engine?
Historically, automakers have recommended breaking in new engines for a few hundred miles with smoother driving to help the components seat and adjust properly. The practice has been ubiquitous for decades to help engines last longer and perform better.
Forces such as pressure and heat can cause components to slightly alter their shapes and conform to other parts. It can take 500 to 1,000 miles of driving for engine components to settle into their proper sizes, shapes, and positions. Once this process is complete, the engine is ready to run at its peak.
According to JD Power, ignoring the process and driving aggressively out of the gate can sometimes cause small imperfections. Improper gaskets and seals can lead to oil consumption and other problems.
Not all new cars require an engine break-in period; it’s still a safe idea
As engineering has become more robust in the automotive sector, some manufacturers have been betting on breaking new engines. According to Consumer Reports, Volvo does not recommend a break-in period for its new vehicles. Other OEMs claim to emulate the factory engine-in process during assembly and testing.
However, driving a new vehicle gently for the first few hundred miles can still be a good idea. A little time spent in real-world conditions can help ensure that gaskets, piston rings, and other components are positioned correctly. In short, it helps engine components fit together better for long-term durability and performance. Taking it easy for a couple of weeks before boosting your vehicle’s performance can pay dividends down the road, even if the OEM doesn’t require it.
Some brands still recommend driving gently at first
While some OEMs have moved away from engine input protocols, others still recommend taking it easy at first.
Consumer Reports says the Ford Maverick is among the new models that require a short engine break-in period. Its owner’s manual encourages owners to avoid aggressive driving, towing or heavy braking during the first 1,000 miles.
Another example is the Hyundai Santa Fe. Consumer Reports’ test model required 600 miles to break in the new engine and 1,200 miles before towing.
What is the best procedure for breaking in a new engine?
The best way to break in a new engine depends on the make and model of your vehicle. The best policy is to always consult your owner’s manual for OEM-specific recommendations.
If you’re not sure if your vehicle doesn’t have specific instructions, it’s still a good idea to take it easy at first. JD Power says drivers should avoid aggressive driving, take longer road trips and avoid using cruise control for the first 500-1000 miles of owning a new vehicle. Doing so can help promote longevity and performance.
