What is the oil capacity of the 90 Dakota 4 cylinder engine

top of the dipstick tube to the tip of the dipstick should be 32.75 " most oil capacities were 4 qts.

COULD BE WORN VALVE GUIDES, WORN VALVES, YOUR HEADS NEED WORK DONE OR JUST REPLACE THEM, @ TODAYS LABOR COST IT MIGHT BE PRUDENT TO JUST REPLACE THEM OR, SELL THE TRUCK,TRADE IT IN , YOUR DECISION !!!

it takes 4 quarts, 4.5 with filter. v6 3.9 oil capacity.

Most 4 cylinder engines have a capacity of between 4 and 5 liters.
I would put 4 liters in , run the engine for a minute or two , wait a couple more minutes for the oil to drain back down into the oil pan , and then check the dipstick. Vehicle should be on reasonably level ground to get and accurate dipstick reading.

The oil capacity should be 4 qts with filter change (approximate). Safely fill with 4 qts and new filter and run the truck for a few minutes. Let set a few minutes and add to fill mark on stick if need be. Hope this will help you.

2000 TOYOTA TACOMA 2.7L 4-cyl Engine Code 3RZ-FE

Engine Oil Grade 1......API* All TEMPS......5W-30 Optional ..10W-30
Engine, 2WD, with filter..........5.5 liters
Engine, 4WD, with filter..........5.4 liters

Manual Transmission,......GL-5/ GL-4 All TEMPS......75W-90
Automatic Transmission,A340E......AF3 / A43D......AF3

Differential, Front/ Rear W/ ADRD......GL-5 ALL TEMPS......75W-90
Differential, Front Less ADRD......GL-5 ALL TEMPS......80W-90

Transfer Case,......GL-4/GL-5 ALL TEMPS......75W-90 Gear oil.

Capacity:
Cooling System, Initial Fill..........8.5 liters
Automatic Transmission, A340E Initial Fill..........1.6 liters
Automatic Transmission, A340F Initial Fill..........2 liters
Automatic Transmission, A43D Initial Fill..........2.4 liters
Automatic Transmission, Total Fill
4 speed A340E..........7.2 liters
4 speed A340F..........10.1 liters
4 speed A43D..........6.5 liters
Manual Transmission, ..........2.5 liters
Differential, With ADRD Front..........1.2 liters
Differential, Without ADRD Front..........1.1 liters
Differential, 2WD V6 Rear..........2.6 liters
Differential, 4WD Extra Long Rear..........2.5 liters
Differential, Short WB With LSD Rear..........2.7 liters
Differential, Short WB Without LS Rear..........2.6 liters
Transfer Case, Electronic..........1.2 liters
Transfer Case, STD..........1 liters

if light is not working then first try this
* move ignition switch to on position, remove oil pressure sensor pin and touch it to engine body where it should get earthing, and same time oil light should come on, if it is not then that wire is disconnected some where in loom .

if you have a 1ZZ engine

4.2 quarts, 4.4 quarts with oil filter change

if you have the 2ZZ engine (XRS model) it is

4.4 quarts, 4.6 quarts with oil filter change

NOTE these are updated capacities that reflect changes identified in TSB: TSB-0134-08 issued July 15, 2008.
Your owners manual will reflect a lesser quantity that Toyota has since revised.

If you have the 4.7 liter  V8 with the engine code (N) 5W-30 If you have the 2.5 liter, 3.9 liter, 5.9 liter 10W30 but 5W-30 can be used under cold climate condition. (Alaska)
Capacity with filter 4.7 engine 5.7 liters of oil Capacity with filter 2.5 engine 4.3 liters of oil Capacity with filter 3.9 engine 3.8 liters of oil Capacity with filter 5.9 engine 4.7 liters of oil
Good luck and hope this helps.