i have never used an additive before in this engine.
the history is something like this:
first 50k QS dino at 3k oci
second 50k PYB and 3k ocis
from 100-110 PP with 3k oci
110-111 PYB
111-113 FS and kreen(1 pint)
current fill quakerstate torque power 10/30
now this is all from memory so the numbers could be off just a tad but its the best i can recall. although i think it went longer than 1k with PYB! but the numbers are close, with in 1000 miles anyhow
the fill hole pics were after the 10k with PP. the car was handed down to my wife with 100k or 90k something like that and i looked over the records in the glove box and chose to run PP because it was advertised as being very clean. of coarse being ignorant(pre bitog) i just assumed it was sludged up because it had only seen PYB and QSAD. out of superstition i chose PP because i figured it would be close enough to PYB to change and not sludge up from changing oil types
all i can say is to this day its only had sopus oils in it and the engine is extremely clean!! this car speaks loads on the pyb/qs sludge myth!!