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With the removal of Zink from most modern oils, and the problems that causes in Alfas and any car with non-roller cam followers in particular, I thought the info below would be interesting to our group.
The study was done by Ed Hacket, a chemical engineer at Univ. of Nevada`s Reaserch Facility. Sorry for the loss of columinization, Site is:http://www.atis.net/oil_faq.html scroll to 2nd section.
% zinc is the amount of zinc used as an extreme pressure, anti-wear additive. The zinc is only used when there is actual metal to metal contact in the engine. Hopefully the oil will do its job and this will rarely occur, but if it does, the zinc compounds react with the metal to prevent scuffing and wear. A level of .11% is enough to protect an automobile engine for the extended oil drain interval, under normal use. Those of you with high revving, air cooled motorcycles or turbo charged cars or bikes might want to look at the oils with the higher zinc content. More doesn't give you better protection, it gives you longer protection if the rate of metal to metal contact is abnormally high. High zinc content can lead to deposit formation and plug fouling.
The Data: Listed alphabetically --- indicates the data was not available Brand VI Flash Pour % Ash % Zinc Brand VI Flash Pour % Ash % Zinc
20W-50 20W-40
AMSOIL (old) 136 482 -38 <.5 --- AMSOIL 124 500 -49 --- ---
AMSOIL (new) 157 507 -44 --- --- Castrol Multi-Grade 110 440 -15 .85 .12
Castrol GTX 122 440 -15 .85 .12 Quaker State 121 415 -15 .9 ---
Exxon High Performance 119 419 -13 .70 .11 15W-50
Havoline Formula 3 125 465 -30 1.0 --- Chevron 204 415 -18 .96 .11
Kendall GT-1 129 390 -25 1.0 .16 Mobil 1 170 470 -55 --- ---
Pennzoil GT Perf. 120 460 -10 .9 --- Mystic JT8 144 420 -20 1.7 .15
Quaker State Dlx. 155 430 -25 .9 --- Red Line 152 503 -49 --- ---
Red Line 150 503 -49 --- --- 5W-50
Shell Truck Guard 130 450 -15 1.0 .15 Castrol Syntec 180 437 -45 1.2 .10
Spectro Golden 4 174 440 -35 --- .15 Quaker State Synquest 173 457 -76 --- ---
Spectro Golden M.G. 174 440 -35 --- .13 Pennzoil Performax 176 --- -69 --- ---
Unocal 121 432 -11 .74 .12 5W-40
Valvoline All Climate 125 430 -10 1.0 .11 Havoline 170 450 -40 1.4 ---
Valvoline Turbo 140 440 -10 .99 .13 10W-30
Valvoline Race 140 425 -10 1.2 .20 AMSOIL (old) 142 480 -70 <.5 ---
Valvoline Synthetic 146 465 -40 <1.5 .12 AMSOIL (new) 162 520 -76 --- ---
15W-40 Castrol GTX 140 415 -33 .85 .12
AMSOIL (old) 135 460 -38 <.5 --- Chevron Supreme 150 401 -26 .96 .11
AMSOIL (new) 164 462 -49 --- --- Exxon Superflo Hi Perf 135 392 -22 .70 .11
Castrol 134 415 -15 1.3 .14 Exxon Superflo Supreme 133 400 -31 .85 .13
Chevron Delo 400 136 421 -27 1.0 --- Havoline Formula 3 139 430 -30 1.0 ---
Exxon XD3 --- 417 -11 .9 .14 Kendall GT-1 139 390 -25 1.0 .16
Exxon XD3 Extra 135 399 -11 .95 .13 Mobil 1 160 450 -65 --- ---
Kendall GT-1 135 410 -25 1.0 .16 Pennzoil PLZ Turbo 140 410 -27 1.0 ---
Mystic JT8 142 440 -20 1.7 .15 Quaker State 156 410 -30 .9 ---
Red Line 149 495 -40 --- --- Red Line 139 475 -40 --- ---
Shell Rotella w/XLA 146 410 -25 1.0 .13 Shell Fire and Ice 155 410 -35 .9 .12
Valvoline All Fleet 140 --- -10 1.0 .15 Shell Super 2000 155 410 -35 1.0 .13
Valvoline Turbo 140 420 -10 .99 .13 Shell Truck Guard 155 405 -35 1.0 .15
5W-30 Spectro Golden M.G. 175 405 -40 --- ---
AMSOIL (old) 168 480 -76 <.5 --- Unocal Super 153 428 -33 .92 .12
AMSOIL (new) 186 464 -76 --- --- Valvoline All Climate 130 410 -26 1.0 .11
Castrol GTX 156 400 -35 .80 .12 Valvoline Turbo 135 410 -26 .99 .13
Chevron Supreme 202? 354 -46 .96 .11 Valvoline Race< /TD> 130 410 -26 1.2 .20
Chevron Supreme Synt. 165 446 -72 1.1 .12 Valvoline Synthetic 140 450 -40 <1.5 .12
Exxon Superflow HP 148 392 -22 .70 .11
Havoline Formula 3 158 420 -40 1.0 ---
Mystic JT8 161 390 -25 .95 .1
Quaker State 165 405 -35 .9 ---
Red Line 151 455 -49 --- ---
Shell Fire and Ice 167 405 -35 .9 .12
Unocal 151 414 -33 .81 .12
Valvoline All Climate 135 405 -40 1.0 .11
Valvol ine Turbo 158 405 -40 .99 .13
Valvoline Synthetic 160 435 -40 <1.5 .12
esearch Facility. This is an excerpt. Enjoy!
The study was done by Ed Hacket, a chemical engineer at Univ. of Nevada`s Reaserch Facility. Sorry for the loss of columinization, Site is:http://www.atis.net/oil_faq.html scroll to 2nd section.
% zinc is the amount of zinc used as an extreme pressure, anti-wear additive. The zinc is only used when there is actual metal to metal contact in the engine. Hopefully the oil will do its job and this will rarely occur, but if it does, the zinc compounds react with the metal to prevent scuffing and wear. A level of .11% is enough to protect an automobile engine for the extended oil drain interval, under normal use. Those of you with high revving, air cooled motorcycles or turbo charged cars or bikes might want to look at the oils with the higher zinc content. More doesn't give you better protection, it gives you longer protection if the rate of metal to metal contact is abnormally high. High zinc content can lead to deposit formation and plug fouling.
The Data: Listed alphabetically --- indicates the data was not available Brand VI Flash Pour % Ash % Zinc Brand VI Flash Pour % Ash % Zinc
20W-50 20W-40
AMSOIL (old) 136 482 -38 <.5 --- AMSOIL 124 500 -49 --- ---
AMSOIL (new) 157 507 -44 --- --- Castrol Multi-Grade 110 440 -15 .85 .12
Castrol GTX 122 440 -15 .85 .12 Quaker State 121 415 -15 .9 ---
Exxon High Performance 119 419 -13 .70 .11 15W-50
Havoline Formula 3 125 465 -30 1.0 --- Chevron 204 415 -18 .96 .11
Kendall GT-1 129 390 -25 1.0 .16 Mobil 1 170 470 -55 --- ---
Pennzoil GT Perf. 120 460 -10 .9 --- Mystic JT8 144 420 -20 1.7 .15
Quaker State Dlx. 155 430 -25 .9 --- Red Line 152 503 -49 --- ---
Red Line 150 503 -49 --- --- 5W-50
Shell Truck Guard 130 450 -15 1.0 .15 Castrol Syntec 180 437 -45 1.2 .10
Spectro Golden 4 174 440 -35 --- .15 Quaker State Synquest 173 457 -76 --- ---
Spectro Golden M.G. 174 440 -35 --- .13 Pennzoil Performax 176 --- -69 --- ---
Unocal 121 432 -11 .74 .12 5W-40
Valvoline All Climate 125 430 -10 1.0 .11 Havoline 170 450 -40 1.4 ---
Valvoline Turbo 140 440 -10 .99 .13 10W-30
Valvoline Race 140 425 -10 1.2 .20 AMSOIL (old) 142 480 -70 <.5 ---
Valvoline Synthetic 146 465 -40 <1.5 .12 AMSOIL (new) 162 520 -76 --- ---
15W-40 Castrol GTX 140 415 -33 .85 .12
AMSOIL (old) 135 460 -38 <.5 --- Chevron Supreme 150 401 -26 .96 .11
AMSOIL (new) 164 462 -49 --- --- Exxon Superflo Hi Perf 135 392 -22 .70 .11
Castrol 134 415 -15 1.3 .14 Exxon Superflo Supreme 133 400 -31 .85 .13
Chevron Delo 400 136 421 -27 1.0 --- Havoline Formula 3 139 430 -30 1.0 ---
Exxon XD3 --- 417 -11 .9 .14 Kendall GT-1 139 390 -25 1.0 .16
Exxon XD3 Extra 135 399 -11 .95 .13 Mobil 1 160 450 -65 --- ---
Kendall GT-1 135 410 -25 1.0 .16 Pennzoil PLZ Turbo 140 410 -27 1.0 ---
Mystic JT8 142 440 -20 1.7 .15 Quaker State 156 410 -30 .9 ---
Red Line 149 495 -40 --- --- Red Line 139 475 -40 --- ---
Shell Rotella w/XLA 146 410 -25 1.0 .13 Shell Fire and Ice 155 410 -35 .9 .12
Valvoline All Fleet 140 --- -10 1.0 .15 Shell Super 2000 155 410 -35 1.0 .13
Valvoline Turbo 140 420 -10 .99 .13 Shell Truck Guard 155 405 -35 1.0 .15
5W-30 Spectro Golden M.G. 175 405 -40 --- ---
AMSOIL (old) 168 480 -76 <.5 --- Unocal Super 153 428 -33 .92 .12
AMSOIL (new) 186 464 -76 --- --- Valvoline All Climate 130 410 -26 1.0 .11
Castrol GTX 156 400 -35 .80 .12 Valvoline Turbo 135 410 -26 .99 .13
Chevron Supreme 202? 354 -46 .96 .11 Valvoline Race< /TD> 130 410 -26 1.2 .20
Chevron Supreme Synt. 165 446 -72 1.1 .12 Valvoline Synthetic 140 450 -40 <1.5 .12
Exxon Superflow HP 148 392 -22 .70 .11
Havoline Formula 3 158 420 -40 1.0 ---
Mystic JT8 161 390 -25 .95 .1
Quaker State 165 405 -35 .9 ---
Red Line 151 455 -49 --- ---
Shell Fire and Ice 167 405 -35 .9 .12
Unocal 151 414 -33 .81 .12
Valvoline All Climate 135 405 -40 1.0 .11
Valvol ine Turbo 158 405 -40 .99 .13
Valvoline Synthetic 160 435 -40 <1.5 .12
esearch Facility. This is an excerpt. Enjoy!