Please tell me which transmission oil should I use for 2003 lancer oz manual. When I called the dealership they told me 75W-90 and doesn't need to be synthetic. I think this is wrong so which one do you recommend? Also if you know a good place to order from?
Thanks...

 

Synthetic or not does not matter, you need 75W-90 GL-4. Make sure you do not use GL-5. GL-5 does not supercede GL-4 they are just different. Be wary of oils saying they meet GL-4 and GL-5 specifications.