when I sold my '92 Vette to buy the Cobra it had about
130,000 miles on it. Never had anything other than mobil 1 in it and did not leak or burn a drop and was just as strong as the day I got it.(drove it pretty hard too
)
So from MY experiance Mobil 1 lives up to the billing and will be used in the Cobra until it fails me.
"if it ain't broke, don't fix it"
Have a good one,
Dan