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Originally Posted by s60ben
Strange, Royal Purple managed to do the API certifications...... And avoid the rhetoric... and the controversy over the 4 ball test...
and from Wiki 
And the reason they always do exceptionally well on the "4 ball test" that they laud about....
Lots of Zinc, which is well known to "fool" the 4 ball test apparently..
http://www.mobiloil.com/USA-English/...il_Claims.aspx |
The latest API specs places more importance on the catalyser than cylinder head protection by the demand of the American Government.
Many automotive enginners believe them to be wrong in the belief that Phosphorus and ZDDP damage the catalyst. Including BMW who told their dealers that use of the latest API certified oil in their engines would void their warranty.
On the provision of information about what's in these oils I noticed this on the Royal Purple web site.
Quote:
The precise composition of this oil is proprietary. A more complete disclosure will be provided to a physician or
nurse in the event of a medical emergency
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So when your in A&E with a vomiting two year old, and it's 3 am in Texas they're going to have a technician to speak to a doctor are they? Assuming you can find a doctor or nurse who can find the time and the switchboard operator to make a call to the USA. I don't fink so.
Roy