Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance How long does synthetic oil last?

I ran the oil 8292 miles, you see two samples of the same oil.

I purchased this car used in April, and wanted to see if I could go 8K plus on an oil change.

I feel confident that I can go 10-12K on Mobil 1 in this car.

However, keep in mind that I did that 8300 miles in 120 days, and will probably drive 2250-2500 miles each month.

People driving shorter intervals may not be able to go 10K miles if it takes a year to get there.

One other thing, I changed the oil filter after the 3161 mile analysis. I used a plain Purolator for the first interval and replaced it with a Purolator PureONE for the last 5k miles.

The car got "Iffy Lube" changes for the first 106K miles of it's life. I have all the receipts from the previous owner.

FWIW,

TB