Originally Posted By: **** in Falls Church
Your hair will turn gray or fall out, your belt will become too small, your teeth will rot, you will become forgetful.
Your car, on the other hand, will still run. The mileage may drop a bit, your change interval will likely shorten, the engine may run hotter, you won't have the protection in case of problems, if you are in extremely cold climate the winter starts may be slower.
You got all the talking points in!
Notice the word MAY.... (And if anyone thinks that you can go ahead and blow a hose or head gasket and syn will allow you to continue to drive away, please don't believe that.)
If you have problems, SHUT the engine OFF and call for help. Do NOT continue operating with ANY oil.
I've gone back and forth with conventional and syn in many motors and all is fine. MPG did not change, engine ran the same temps (using scan gauge / accurate Autometer mechanical gauges) no matter what type/brand of oil I used.
Take care, bill