First pardon me for cross-posting. It is not meant to irk anyone but to ask
as many people knowledgeable about GM cars as possible.
When I recently purchased my 2007 Saturn ION 2, the first thing I asked the
service people is when can I switch to syntetic oil.
They recommend waiting until at least 10-15,000 kms to make the switch and
use ONLY Mobil 1.
Just as if other companies don't make good quality synthetic oil. Sheesh!.
But I can live with that. Mobil 1 is excellent stuff.
What makes me perplexe is when they said not to use synthetic in the
standard transmission. I don't understand their reasons why.
So, is there anyone out there who can explain why I shouldn't use synthetic
Are you absolutely, positively sure the oil caused the failure?
I have used Amsoil for many years and have had great results in my cars,
motorcycles and lawnmowers. I know other people who rave about it too.
In the early years, (early 70's), seals shrunk with Amsoil but seal swelling
agents solved the problem.
I think Mobil 1 was causing the same problems but I am not 100% sure.
Police fleets, trucks fleets, racers, etc, use Amsoil and other synthetic
oils with good results.
Did you have an oil analysis done to prove it was the cause of the main
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