well its not only race engines that need all the goodies added,like zinc and phosphorous.ive got a bunch of older v8 that must have it.ive told everyone i know that messes with these older cars that they have to use the tpyes of oil in them that was on the shevles when they were manufactured.ive seen with me own eyes engines screwed up because they had modern oil put in them.im using straight 50 or 60 in my older ones in the summmer and come cooler weather we use 10w 40.my 62 galaxie has the original 352 has 88,000 miles on her and ive put 20,000 on her. it sat for 20 yrs and never had any modern oil in it.to me any engine built from the 80s back gets the additives.