I do extended drains on my synthetic oil. I have used the Fram XG 10,000 filter several times. Currently using Mobil 1 EP and have for last 3 fills and next change will be a Napa Platinum because they were on sale. I have done many OCI at 6,000 to 8000 miles, closer to the higher number. So my question is, was the PureOne built or designed to go that far? You can assume my engine is very clean since it's been synthetic most of its life.
Last edited: