Originally Posted By: dave1251
Originally Posted By: OVERKILL
Originally Posted By: dave1251
Your engine has been designed to use Motorcraft engine oils or equivalent oils that meet Ford
specifications. It is also acceptable to use an engine oil of recommended viscosity grade that
meets API SN requirements and displays the API Certification Mark for gasoline engines.
From Ford on the ford wss-m2c945-a spec.
Yeah, depends on the spec. Some of them are a bit more strict.
What for a GT 500?
Well yeah, that's a pretty good example, LOL!!!
But say for example the 2013 Mustang manual:
http://www.motorcraftservice.com/pubs/content/~WODMUS/~MUS~LEN/42/13musom3e.pdf
Originally Posted By: Ford
2. Add engine oil that meets Ford specifications. See Capacities and
Specifications for more information.
Quote:
WSS-M2C945-A with API
Certification Mark
Use of synthetic or synthetic blend motor oil is not mandatory. Engine oil need only meet the
requirements of Ford specification WSS-M2C945-A and display the API Certification Mark.
Your engine has been designed to be used with Ford engine oil, which gives a fuel economy
benefit while maintaining the durability of your engine.
Using oils other than the one specified can result in longer engine cranking periods, reduced
engine performance, reduced fuel economy and increased emission levels.
No mention of just using an oil that meets the API SN requirements.
Probably varies by vehicle. Where did you get your info?
