For the .02 that my opinion is worth go with the synthetic if that's what you want to use. I'm not aware of any way it can damage your engine. I've not heard of synthetic damaging transmissions either. If someone has a link to information saying that it does I'd be interested in reading it. Synthetic in transmissions info from Mobil.

Last edited by Tiny; 06/07/2013 3:53 PM. Reason: Added link

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.