i want to swicth to some synthetic tranny fluid this spring when i do a tranny fliter chage. right now, i am using good old AC Delco tranny fluid, and i want to switch to some type of synthetic (amsoil possibly).

does ALL of the conventional stuff have to be out to do this? it will be next to impossible to empty the torque converter of all the old stuff while it is still in the car.

what do you guys think?

thanks...

-Brian

ps..i did a search and found nothing.

 

No, unless otherwise stated on the bottle.

 

ya i would be more worried abuot mixing differen't types of synthetics.. but regular and synthetics i wouldn't worry

 

Although typically compatible (and AMSOIL is) with petroleum-based ATFs, you lose some of the benefits of synthetic when mixed with the old fluid. We're talking more than residuals here, like the above-mentioned torque converter. So, getting as much of the old out as possible is a good idea.

Here's AMSOIL's recommended change and flush procedure http://www.amsoil.com/faqs/faq8.htm . I've been doing it this way for years (before they posted it on the website, in fact).