Leaking oil tahoe

recheck air level in all tires --if pressure good then tpi failure --when pressure is correct tri resets automatically

Possibly master cylinder,but usually if you have to add fluid it's probably leaking if your getting fluid on every line but if your not possibly or master cylinder problem

intake gasket might cause it if the coolant froze and broke the seal between the head and intake and is leaking directly into the lifter valley

Could be a head gasket you should check the pressure in the firring chambers. Did you check all fuses?

If you have a positraction unit (both rear wheels turn in the same direction when turned off the ground) You should use synthetic. Otherwise you can use standard 75/90 or 75/140 lube. If it's leaking you may try adding lucas sealer to slow the leak (read instructions for percentage of additive and product application)

YOU HAVE A RUPTURE PRESSURE LINE IF YOU HAVE NO POWER STEERING FLUID IN THE POWER STEERING RESERVOIR.LOCATE LEAK THEN BLEED POWER STEERING SYSTEM BY ADDING POWER STEERING TO RESERVOIR.DONT OVER FILL BY FULL COLD MARK ON POWER STEERING DIP STICK.ADD FLUID TO RESERVOIR WAIT A 2 MINUTES.CHECK FLUID LEVEL AGAIN.WHEN POWER STEERING FLUID LEVEL STOP DROPPING.START ENGINE LET IT RUN FOR 10 SECONDS.THEN TURN OFF ENGINE CHECK POWER STEERING FLUID ADD FLUID IF FLUID LEVEL DROPS. WHEN FLUID LEVEL STOP DROPPING.SAFELY RAISE SUPPORT VECHICLE FRONT WHEELS.START ENGINE.NOW TURN STEERING WHEEL GENTLY FROM STOP TO STOP MEANING LEFT TO RIGHT DONT HOLD IN POSITION.LET THE STOP TO STOP BE QUICK.CHECK POWER STEERING FLUID AFTER YOU HAVE TURN STEERING WHEEL ABOUT 7 STOP TO STOP.WHEN FLUID LEVEL STOP DROPPING YOU AT HOT MARK ON DIP STICK BLEEDING PROCESS COMPLETE.TURN OFF ENGINE LOWER VECHICLE BACK TO GROUND WAIT ABOUT 5 MINUTES CHECK YOUR FLUID LEVEL.IF FLUID LOOKS LIKE A TAN COLOR.YOUR POWER STEERING SYSTEM FULL OF AIR.TURN OFF VECHICLE LET VECHICLE SET A LONG WHILE TO AIR BUBBLES SETTLE DOWN LOOK FOR LEAKS AROUND POWER STEERING PUMP FRONT SEAL AND CHECK FOR LEAKS AROUND POWER STEERING LINES.

check coolant fluid level, after vehicle is cool allow vehicle to run adding coolant/water till the tank is full, then let it run for one minute and shutoff, allow engine to cool and **** in fluid, and more water and coolant (dextron coolant) and start the vehicle back up after it has cooled complety down. with the cap off the coolant place hand over cap, if you get immediate back pressure this isnt from thermal expansion is from a blown head gasket. also for this check to ensure water pump isnt leaking, because the pressure generated by a blown head gasket will blow out water pump seals, if there is no back pressure, but a leaking water pump, just replace the water pump.

Change front/rear axle oil
Change transfer case oil
Air filter
Engine coolant
Rotate tires
Fluid level on battery/radiator/brakes
Change oil and filter
Inspect for fluid leaks
Inspect coolant and heater hoses
Check exhaust system
Check drive belts/tires/wheels/brake lines
Check steering operation/disc brakes/brake pedal play
Check parking brake
Check and lube accelerator linkage
Check suspension/steering/power steering fluid
Lube body and chassis
Check TOD system fluid
Check cruise control linkage and hoses
Check starter safety switch
Lube key lock cylinder

your owners manual will tell you exactly. usually all filters should be changed (oil, air, auto transmission if equipped, fuel, cabin air etc) as well as spark plugs and wires, distributor cap and rotor if equipped, check the belts and hoses as well as the charging system. All fluid levels should be checked and topped off. Check your tire p.s.i. as well.

I will give you solutions in this order:
1. change oil and oil filter
2. check air filter, all lights ( brake, signal, head lamps both low and high beam, backup, and side markers) all fluids, belts, tire pressures, check the condition of transmission fluid it to may needs changing alone with a new filter if you havn't changed it before.Check and change as needed spark plugs and wires. HAPPY DRIVING.