The alx w30 is bugged, but it can still be used
gf-4 sae 10-w30 or 5-w30
w40
Horsepower rating is 370 brake horsepower @5200 rpm. Since the regular 442 in 1970 had 365 hp @ 5000 rpm, it is believed the W30 was underated at 370 and is more like 420 bhp. Torque rating for the W30 is 500 lb ft @ 3600 and the non W30 is 500 lb ft @ 3200.
if it is below -18 or above 38 Celsius... you need 5 W30 if it in between you need 10 W30
5-w30
10 W30 is heaver
10 w30
5-w30
5 w30
v38
Many lube shops are now using 5 W30. 10 W30 still works well too. Just ask the folks at your oil change shop what they recommend.