[et7333]

.

Directly from the Hot Rod article, June 2006, When Good Cams Go Bad:

SH API oil rating 1996
zinc = 0.130%, 1130ppm (parts per million)
phosphorous = 0.120%, 1120ppm

SJ API oil rating 2001
and
SL API oil rating 2004
zinc = 0.110%, 1100ppm
phosphorous = 0.100%, 1000ppm

SM API oil rating 2005
zinc = 0.087%, 870ppm
phosphorous = 0.080%, 800ppm

SM API oil rating 2007
zinc = 0.060%, 600ppm
phosphorous = 0.080%, 800ppm

Cosworth Racing Oil
zinc = 0.125%, 1250ppm
phosphorous = 0.115%, 1150ppm

Shell Rotella T CI-4
zinc = 0.140%, 1400ppm
phosphorous = 0.130%, 1300ppm

Pennzoil 25W-50 Racing Oil
zinc = 0.196%, 1960ppm
phosphorous = 0.180%, 1800ppm

Quaker State Q Racing Synthetic
zinc = 0.200%, 2000ppm
phosphorous = 0.180%, 1800ppm
Obviously, the 4 oils above do not have an API rating for newer engines. Their rating would be SH or SG. Pennzoil Racing is SG. Rotella is SH/SJ.
From the Kendall website for GT-1, which I've used since 1964 and now can no longer use for fear of cam and lifter damage:

additional spec. for oils of interest:

Kendal GT-1 green 40W, old mfg.
zinc = 0.200%, 2000ppm
phosphorous = 0.200%, 2000ppm

Kendall GT-1 amber 40W. Older green GT-1 used in Thunder and still have 5 quarts of the green oil left. New GT-1 color is amber. Green GT-1 has high zinc and phosphorous content. Amber GT-1 has low content.
zinc = 0.104%, 1040ppm

Kendal GT-1 amber 30W. Older green GT-1 was used in the other Olds engines.
zinc = 0.104%, 1040ppm

Kendal GT-1 amber 20W-50
zinc = 0.113%, 1130ppm

Kendal GT-1 amber 10W-40
zinc = 0.086%, 860ppm

Also:
Chevron Delo 400 10w-30
zinc = 0.140%, 1400ppm
phosphorous = 0.126%, 1260ppm

Chevron Delo 400 10W and 20
zinc = 0.127%, 1270ppm
phosphorous = 0.114%, 1140ppm

Chevron Delo 400 30, 40, and 50
zinc = 0.127%, 1270ppm
phosphorous = 0.116%, 1160ppm

Chevron Delo 400 Synthetic 0W-30
zinc = 0.130%, 1300ppm
phosphorous = 0.114%, 1140ppm

Chevron Delo 400 Synthetic 5W-40
zinc = 0.151%, 1510ppm
phosphorous = 0.136%, 1360ppm

Valvoline VR1 20W-50 Racing oil
zinc = 0.130%, 1300ppm
phosphorous = 0.120%, 1200ppm
sulfated ash = 1%
calcium = 0.250%, 2500ppm
NOACK % off @ 250C = <15% (This rating tells how much oil will be lost as vapor at high operating temperatures. 15% is the break point. 10% is very good. 5% is fantastic.

Valvoline Not Street Legal Synthetic Racing Oil
zinc = 0.120%, 1200ppm
phosphorous = 0.120%, 1200ppm

Valvoline Not Street Legal Conventional Racing Oil
zinc = 0.120%, 1200ppm
phpsphorous = 0.120%, 1200ppm

Royal Purple Synthetic Racing 21 Oil 5W-30
zinc = 0.1961%, 1961ppm
phosphorous = 0.1130%, 1130ppm
calcium = 0.2994%, 2944ppm

Royal Purple Racing 41 Oil 10-40w synthetic
zinc = 0.1901%, 1901ppm
phosphorous = 0.1171%, 1171ppm
calcium = 0.2843%, 2843ppm

Royal Purple 15-40 w Synthetic
zinc = 0.1213%, 1213ppm
phosphorous = 0.1126%, 1126ppm
calcium = 0.2961%, 2961ppm

Harley Davidson 20W-50 Synthetic
zinc = 0.1068%, 1068ppm
phosphorous = 0.997%, 997ppm
calcium = 0.1342%, 1342ppm

STP oil treatment
zinc = 0.1959%, 1959ppm
phosphorous = 0.1814%, 1814ppm
calcium = 0.1371%, 1371ppm

Redline Synthetic 10W-40
zinc = 0.1350%, 1350ppm
phosphorous = 0.1371%, 1371ppm
calcium = 0.2782%, 2782ppm

Redline Synthetic 10W-30
zinc = 0.1407%, 1407ppm
phosphorous = 0.1340%, 1340ppm
calcium = 0.2869%, 2869ppm

Redline Synthetic 5W-30
zinc = 0.1421%, 1421ppm
phosphorous = 0.1419%, 1419ppm
calcium = 0.2917%, 2917ppm

Mobil 1 Synthetic
zinc = 0.1376%, 1376ppm
phosphorous = 0.1223%, 1223ppm
calcium = 0.2937%, 2937ppm