Hi,

I tend to like Redline Oil products, particularly for the diff and gearbox. Check their website for the product listing.

As for the gearbox, these cars have two types of Getrags, some that use ATF and some that use gear oil. There should be a colored tag on the flange where the gearbox mates with the engine, visible from under the hood. It will be either green or orange and will state "ATF only" if it needs ATF. I used Redline D4ATF and the box seemed to love it. Otherwise, your dealer can check based on the VIN number.

Coolant - yes, definitely use the OEM stuff. Check the hoses as this might be a good time to replace them. Same goes for the radiator, particularly at the neck for the upper hose. They tend to snap off catastrophically at the worst possible time. The expansion tank also has a weak spot where the exit hose is. Inexpensive to replace the whole tank.

Regards,
Adnan