Hi Everyone.  Chris Longhurst has been kind enough to post the API 
service bulletin from Castrol oil on the web at the following 
address:

http://www.geocities.com/MotorCity/2195/castrol.html

Chris was instrumental in my research on this, and was also very kind 
to post the bulletin.  He has an excellent page on auto related 
topics.

Harry.
Harry Yates, Langley, British Columbia Canada
'90 Syncro Westfalia   WWW - http://www.bcit.bc.ca/~hyates
'87 Golf Diesel        email:  hyates@bcit.bc.ca
'91 Miata (Millie)