My SC400 just hit 75,000 miles yesterday and is due for an oil change in just a week. Besides the normal oil change, I was thinking I would change my transmission fluid and differential oil at the same time. I'll be using toyota type-IV tranny fluid (how much?) what differential oil should I use?

Also, should I switch oil type now that I have a "higher-mileage engine?" I stick to the factory recommendation of 5W-30 (mobil1) Should I bother going to 10W-30?

Anything else I should look into doing at this service interval? Timing belt has been changed along with plugs and brakes... I basically had it completely tuned up at 60K.

 

Oh and one more thing, I'd also like to change my transmission filter, does anyone have the part number on that?

Thanks.

 

For the differential, I would HIGHLY recommend Redline 75W90, and also sticking to Mobil1...but switching to 10w30.