daniele, lascia perdere i nostri olii. i motori americani hanno tuttaltre esigenze : hanno valvole enormi e pressioni del lifter sulla cam causa molle dure che i nostri motori di piccola cilindrata o 12 cyl non hanno.sui forum americani un sacco di gente si è trovata con cam spianate dopo neanche 1000km. segui il post sul forum americano. questo il mio consiglio.

di seguito , ciò che recentemente ha scritto kevin , quello che ha seguito la costruzione del mio motore


Good question. I have seen 1200 min many times but do not know where it came from.
Enginebuilder magazine recommends 1600 PPM on all flat tappet and performance roller cammed engines and 2000 PPM for racing use:
http://www.enginebuildermag.com/Arti..._additves.aspx
It also explains that RPM, cam type and spring pressures will dictate the level of Zinc needed. A stock flat tappet cam that is driven as a normal car might be fine with 1100 or 1200. A performance hydraulic flat tappet with fast ramps that sees 6000 RPM regularly might need more maybe up to 1600. A racing application with heavy springs and a high lift solid flat tappet that sees 7500 RPM regularly might need 2000 PPM. I really don't think there is a number that is carved in stone and has research to back it up anywhere I know of. All I do know is I would rather be safe than wish I would have used something else. Err on the side of caution! There have just been too many failures and issues with modern oils and as the article you posted states.