My neigbor said that back in the 70s or maybe it was the early 80s he had a Monza with an Iron Duke in it, I think he used quaker state back then, not sure if it was 10w30 or straight 30, but he had added some STP or an additive like that to the oil and aparently added too much and when he went to start the car on a cold winter day the oil filter went BOOM!