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Can I Use Cruise Control During The Break-In Period On My BluePrint Engine?

Proper break-in is one of the most important steps in maximizing the performance and longevity of your new BluePrint crate engine. One question that often comes up after installation is whether cruise control can be used during the first 500 miles. This article applies to BluePrint SBC, BBC, SBF, LS, and Mopar-based crate engine packages that require a break-in period.

 Can I Use Cruise Control During Break-In?

No, BluePrint does not recommend using cruise control for extended periods during the initial break-in period. During break-in, the engine should experience varying RPM and varying engine load. Cruise control is designed to hold a constant vehicle speed, which often results in extended operation at nearly the same RPM. Proper ring seating and component wear patterns develop best when engine speed and load are regularly changed during normal driving. Why Is RPM Variation Important? Varying engine RPM helps the piston rings seat properly against the cylinder walls. During the first 500 miles, changing engine speed allows:

  • Proper piston ring seating
  • Even cylinder wall wear patterns
  • Improved oil control
  • Better long-term compression
  • Reduced risk of glazing cylinder walls
Maintaining one engine speed for a prolonged period can slow the break-in process. What Driving Style Is Recommended? Normal street driving with frequent RPM changes is ideal. Good break-in driving habits include:
  • Accelerating and decelerating normally
  • Driving on roads with changing speeds
  • Varying engine RPM whenever possible
  • Using multiple gears when appropriate
  • Monitoring engine temperature, oil pressure, and fluid levels
Avoid:
  • Long highway trips at a fixed speed
  • Extended cruise-control operation
  • Sustained high RPM operation
  • Extended idling
  • Continuous wide-open-throttle runs
  • Heavy towing or hauling
Can I Drive On The Highway During Break-In? Yes, but use highway driving correctly. Highway driving itself is not harmful. The goal is simply to avoid holding the engine at one RPM for long periods. If highway travel is necessary:
  • Periodically vary vehicle speed when traffic conditions allow
  • Change gears if equipped with a manual transmission
  • Avoid hours of uninterrupted constant-speed driving
  • Turn cruise control off and vary throttle input occasionally
What About Overdrive Transmissions? Overdrive transmissions are acceptable during break-in, but RPM should still be varied. Vehicles equipped with:
  • 700R4
  • 4L60E
  • 4L80E
  • 6L80E
  • T56
  • TKX
  • AOD
  • 4R70W
can be driven normally during break-in. However, do not rely on cruise control to maintain one engine speed for extended periods. When Can I Use Cruise Control Normally? After the initial 500-mile break-in period and first oil change, normal cruise-control operation may be resumed. At that point:
  • Change the oil and filter according to BluePrint recommendations
  • Verify there are no leaks or installation issues
  • Confirm proper operating temperatures
  • Resume normal driving habits

Once break-in has been completed, occasional extended highway cruising is acceptable. 

 Frequently Asked Questions

Can a short period of cruise control hurt my engine?

No. Brief use is unlikely to cause issues. The concern is prolonged operation at the same RPM throughout the break-in period.

What is more important: speed or RPM?

RPM variation is the key factor. The objective is to avoid operating at one engine speed for extended periods.

Can I take my vehicle on a road trip during break-in?

Yes, but plan to vary engine speed regularly and avoid using cruise control continuously.

Does dyno testing complete the break-in process?

No. Even though BluePrint engines are dyno tested, the recommended vehicle break-in procedure should still be completed.

When is break-in considered complete?

Typically after the first 500 miles and the required oil and filter change.