I am thinking of running Valvoline VR1 racing conventional motor oil in my 1993 Mazda RX-7 Twin Turbo (18,500 orginal miles). It is ZDDP reinforced. The levels of Zinc/Phosphorus are .14/.13.
I was wondering two things. How high are those levels really? Do they pose a real threat to either the environment or my catalytic converters? How fast will an oil with those zddp levels kill my cats?
My car's manual originally called for a "SG" oil and I heard "SG" oils back in the day had Zinc/Phos levels of .12/.13 based on something I read (On wiki so not sure if true). So am I correct in assuming that by using VR1 with Zinc/phos of .14/.13 I am really not using much more ZDDP than what would have already been in an "SG" oil back in 1993?
Thanks,
Drew
I was wondering two things. How high are those levels really? Do they pose a real threat to either the environment or my catalytic converters? How fast will an oil with those zddp levels kill my cats?
My car's manual originally called for a "SG" oil and I heard "SG" oils back in the day had Zinc/Phos levels of .12/.13 based on something I read (On wiki so not sure if true). So am I correct in assuming that by using VR1 with Zinc/phos of .14/.13 I am really not using much more ZDDP than what would have already been in an "SG" oil back in 1993?
Thanks,
Drew