Engine Break-in

Cosworth tips for break in:

Adam,

Here are some general break in guidelines.

Let us know how it turns out.



Before Starting

During the break-in process, we recommend using a high quality API SJ or newer mineral 20W-50 engine

oil. We also recommend using a genuine Mazda oil filter. Do NOT use a synthetic or synthetic blend

during the break-in process. We also strongly recommend priming the engine’s oil system before starting.

To do this, make sure there is no fuel or spark by disconnecting either the ECU or by removing the

appropriate fuses. Then crank the engine for 30 seconds or until there is oil pressure registering on an oil

pressure gauge.

Engine Break-in

Upon initial start-up hold the engine at 2000rpm for 10-15 minutes for proper camshaft break-in. If the

engine will be broken in by driving the car, then drive the vehicle at various loads, speeds, and throttle

positions while keeping engine speeds below 4000 rpm for approximately 1000 miles or 1660 kilometers.

The longer the engine is broken in, the better your results will be.

The engine should be calibrated to achieve an air fuel ratio rich enough for
the type of fuel you are using. Consult with a professional tuner if you are unsure of what air fuel ratio

you should be running.