Originally Posted by gmabry75
Not quite sure where you got your information, but it's way off base. I don't know of any modern engine that doesn't have a normal operating temp of 210 or higher. So if that were the case synthetic would not be good for any engine. Regardless of what some people think, synthetic oil IS superior to any conventional oil.
Synthetic being introduced to older engines increases the potential for seals leaking.
I have a GMC, and a taurus with over 200,000 miles on them and have run nothing but Castrol dino oil, and fram filters. Not a drop of oil out the exhaust, or the seals.
Knocking on wood right now.