Engine - Ford 2008 F-150 Owner's Manual

ENGINE

Engines are more efficient when they are clean because grease and dirt
buildup keep the engine warmer than normal. When washing:
Take care when using a power washer to clean the engine. The
high-pressure fluid could penetrate the sealed parts and cause
damage.
Do not spray a hot engine with cold water to avoid cracking the
engine block or other engine components.
Spray Motorcraft Engine Shampoo and Degreaser (ZC-20) on all parts
that require cleaning and pressure rinse clean.
Cover the highlighted areas to prevent water damage when cleaning
the engine.
Never wash or rinse the engine while it is running; water in the
running engine may cause internal damage.
4.2L ENGINE
2008 F-150
Owners Guide (post-2002-fmt)
USA
Cleaning
331