Please, I am not trying to start another oil debate, only asking a question of those who have had experience is this area.
I am thinking about changing over to AMSOIL 20W-50 in my 1984 500SEL with 250K miles. Currently using Rotella 15-40 dino and all is well but I have read so much about the better mileage and engine life with syn oil. AMSOIL is hard to find, but is a true syn oil with a good reputation.
My experiences with syn oil in the past hasn't been very favorable in Domestic cars.
What do some of you think?

Thanks

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84 500 SEL (307,xxx miles)