What brand of fluids do you guys suggest I use on my 98 gs300 to change my brakde fluid, transmission, engine coolant, differential fluid? Plus what filters need to b replaced at 90k miles? Appreciate any help.

 

Get the Toyota Dot3 brake fluid or any good brand.
Transmission fluid use Toyota Type T-IV.
Just change the oil filter and air filter. Fuel filter is suppose to be life long.

 

Toyota ATF-IV is best for ATF, but you can also not go wrong with Mobil 1 ATF.

Personal experience tells me if you are at altitudes below 1 mile, DOT 3 from Toyota or possibly a DOT 4 if you do some hard braking. Both are okay. I personally use a DOT 5 synthetic, but that is because I live at an elevation above 1 mile, and have lots of speed bumps and sudden stops. Otherwise, best not to use. I do happen to use Valvoline synthetic Power Steering Fluid, and have had much better control. Again, I use it due to my conditions.

I am not sure any differential fluid needs to be replaced on those particular models, but I could be wrong.

The Toyota coolant is more than sufficient, and that is likely the most important thing to get changed.

Both your oil and air filters will be changed at 90K. The Toyota/Lexus brand filters are okay, but personally I like K&N Gold Oil Filters (Good experience with Mobil 1 filters, too) and the K&N air filters.