She forgot to check!!! They had to add a total of 4 Quarts to her car. It is hard to say how many days she had been driving her car with no more oil than the filter itself would hold…. Her car is a 4cyl and there is no Doubt in my mind, had I not used X- 1R in her car, that Engine would have been gone, seized up, or badly damaged! There is no sign of reduced performance or engine noise… And investment of under $15 saved a $2000 engine.. . no doubt. .. And yes I did put on a new oil pan gasket and re-added X- I R. Just incredible.. My Best Regards and Thanks,