I had learned thru the years, that its not a good idea to start putting synthetic into an engine that has over 50k on it. The seals may start leaking because the syn. will clean things up, and is thinner, and will find its way out.
OOOPPSSS!!! 2 years ago I had a brain fart, and replaced the Dextron 3 in my Power Steering with Amsoil syn. 1 month later, the rack blew the left end seal. Oil everywhere !!!
It happened on the way to the "Hot Import Nights" car show at the L.A. Covention center, Sat. night on Labor Day weekend. Well, I said f*** it, and went on in and had a great time, as I'd just have to deal with my problem on Sunday. (you should definately attend one of the shows near you)
So.....be cautious with swapping to syn. on old systems and seals.
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