Just ran across this article relating to Porsche. "Porsche's recommendation in hand, our initial analysis from 2005 and
2006 found that all recent SH/SJ/SL formulations of Mobil lubricants tested, including Mobil 1, have had similar 0.12-0.14% Zn and P content, which we think is a good thing, but looking closer, Mobil 1 0w40 had somewhat less Zn and P, at 0.10%. Current SM formulations are at the 0.10% level or less. This confirms the industry wide trend of the reduction of Zn and P from motor oils, with the eventual reduction to 0.06-0.08% or even worse, the elimination of these additives, which are essential to an aircooled Porsche engine's longevity." "........................... Prior to the new CJ-4 API standard for diesel oils, we found most of the CI-4 15w40 and 5w40 oils to have excellent levels of Zn and P. We did observe Mobil, among other manufacturers, beginning the use of boron in their oils as a zinc-free (ZF) anti-wear additive in various CI-4 and SL formulations, but always with high Zn and P levels, above current API limitations." "What motor oils had the 0.12% levels of zinc and phosphorus recommended? The current API standard is SM, and calls for 0.06-0.08% Zn and P. The new CJ-4 standard which supercedes CI-4 calls for no more than 0.1% P. Some of these reformulations have new zinc-free anti-wear additives, but we still think a target of 0.12% is ideal for Zn and P levels as documented by the 1977 SAE Journal paper titled "Cam and Lifter Wear as Affected by Engine Oil ZDP Concentration and Type", which evaluated the performance of these oils in various fleets around the country over the span of many years.Name Vis P (ppm) Zn (ppm) API Type
Amsoil HDEO 5w40 794 1081 SYN Amsoil Series 2000 Racing 20w50 1014 1123 SYN Amsoil V-Twin/MC 20w50 1193 1281 SYN Castrol GTX 20w50 1157 1422 DINO Castrol GTX High Mile 20w50 1248 1382 DINO Castrol Syntec 5w40 786 918 SYN Castrol Syntec 5w50 921 914 SYN Castrol Syntec Blend 20w50 937 916 SEMI Castrol Tection Extra 15w40 965 1094 DINO Chevron Delo 400 15w40 1191 1622 SYN Delvac 1300 Super 15w40 1380 1702 DINO Exxon Av Oil 20w50 702 32 SEMI Exxon Superflow 20w50 717 848 DINO Ford Motorcraft 5w20 545 848 SEMI Harley Davidson Syn3 20w50 1081 1182 SYN Kendal GT (Vintage) 20W50 1229 1415 DINO Kendall GT 20w50 904 1233 DINO Mobil 1 0w40 808 976 SYN Valvoline All Fleet Plus 15w40 1110 1232 DINO Valvoline Durablend 20w50 566 732 SEMI Valvoline Max Life 20w50 691 879 DINO Valvoline Prem. Blue 15w40 1314 1838 DINO Valvoline Synpower 20w50 605 689 SYN Valvoline VR1 20w50 1085 1293 DINO Valvoline VR-1 NSL 20w50 835 976 DINO Valvoline VR-1 NSL 20w50 842 962 SYN Power Service Oil Extender 3567 4945 O/A STP Blue 1704 2436 O/ A STP Red 2115 3932 O/A