I have a 2007 SRX with over 90,000 miles. I just purchased the vehicle and am going to do a full overhaul to make sure I know everything is done correctly. In my experience I have used the Ford transmission fluid on my older high mileage vehicles because the viscosity is higher and helps with taking up more space in worn clutches. Is this true with newer transmissions or should I not worry about that anymore and use stock? Thank you for your help first time posting to this site.