It's my understanding that Delvac and Rotella oils have reduced ZDDP and their other additives are not the best for gasoline engines. I'll let you make up your own mind with some information provided with these links:
http://www.volvoclub.org.uk/castrol_with_zddp.shtml
http://www.macysgarage.com/myweb6/ZDDP.htm
http://forums.corvetteforum.com/c1-a...-zddp-oil.html
Doug
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64.5 Convertible 260 V8, 87 El Camino, 2002 Jaguar XJ8, 2000 HD Road King
 
Last edited by dougs64; 11-04-2009 at 02:51 AM.
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