What type of maintenance my car would need after 90,000 miles

It is really your choice but your 4Runner is capable of allot more miles with good maintenance. If your looking to save money the V8 4Runner in not a good option.

None. Check fluid levels to make sure there has not been a loss of fluid, but there should be no need for maintenance at that low miles.
If it is an automatic, I would change ATF around 90,000 miles.
A manual transmission is basically good for life, as long as the level is good.

The light comes on at fairly short intervals ... even to let you know that you need an oil change. The mileage at which it comes on will depend on when it was reset last time. Here's a link to Yahoo Answers to turn the light off yourself.
http://answers.yahoo.com/question/index?qid=20080305080020AA1XbGo

yes, spot on......did you have the 30 slightly later than 30....??

i would get it serviced if youre happy with the car theyre known for doing super high milegages,with no problems if you service them,to change over cars will be a false economy

carsoup.com
online classifieds
craigslist.org
or online dealer.

Use sludge protectant oils and change transmission fluid often. Do all the maintenance on time or before. Like differential fluids and etc. look in your service manual on what to do and do it in time.

If you had the 90,000 mile service done, and was performed to the service maintenance guide, not much is needed at 100K mils; oil change and tire rottion; replace the air filter.

No they are not. The reason your manual does not saying anything about replacing the timing belt is because 9 times out of 10 most people do not know how to replace the timing belt and make sure that it is on properly and the timing is correct. Also the time belt should be changed around 115,000 miles. But it is never bad to go ahead and get it done if they already did it or are going to

Normal Maintenance Details
90,000 Miles (144,000 Kilometers) : All Applicable Models
PERFORMED OPERATION COMPONENT
INSPECT BALL JOINTS
If equipped.
INSPECT BRAKE SYSTEM
Inspect brake pads, shoes, rotors, drums, brake lines & hoses.
INSPECT COOLING SYSTEM HOSES & CLAMPS
INSPECT DISC BRAKE PADS & ROTORS
INSPECT DRIVESHAFT
If equipped.
INSPECT DRIVESHAFT/PROPELLER SHAFT U JOINTS
INSPECT EXHAUST SYSTEM AND HEAT SHIELDS
INSPECT PARKING BRAKE SYSTEM
INSPECT STEERING LINKAGE
INSPECT SUSPENSION COMPONENTS
LUBRICATE DRIVESHAFT/PROPELLER SHAFT U JOINTS
LUBRICATE STEERING LINKAGE
REPLACE AIR CLEANER/ELEMENT
REPLACE AUTOMATIC TRANSMISSION FLUID
REPLACE CABIN AIR FILTER
If equipped.
REPLACE CLIMATE-CONTROLLED SEAT FILTERS
If equipped.
REPLACE ENGINE OIL
REPLACE ENGINE OIL FILTER
REPLACE FUEL FILTER
ROTATE TIRES
90,000 Miles (144,000 Kilometers) : RWD
PERFORMED OPERATION COMPONENT
LUBRICATE BALL JOINTS
2000 Lincoln Navigator
Maintenance
...sorry if not too readable