2005 GTO Fluids

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Power Steering

The GTO power steering system uses Dexron III ATF. Make sure you USE ATF, and not Power Steering Fluid! Your pump will go out using power steering fluid.

Changing the Power Steering Fluid.

Important
Do not reuse any drained power steering fluid regardless of appearance or condition.

• Raise and support the front of the vehicle off the ground in order to remove the weight of the vehicle from the front tires.
• Loosen the hose clamp on the inlet side of the reservoir. (higher one)
• Remove the power steering fluid reservoir inlet hose from the reservoir.
• Position the hose toward a drain pan in order to catch the draining fluid.
• Drain the fluid.
• Plug the inlet hose connection on the reservoir.
  

A4 Transmission

Castrol Dexron III, do not use synthetic. You need some friction in an automatic transmission to make it work correctly.

Oil

6.5 quarts for the LS2. Mobile 1 5W30
Keep records of every oil change.

Document ID#1409149 - 2005 Pontiac GTO
"Excessive oil consumption, not due to leaks, is the use of 1 L (1qt) or more of engine oil within 3200 kilometers (2,000 miles)"

Check oil early in the morning. It takes awhile for the oil to drain back into the pan, so check when it’s cool.

Differential Gear

Change the differential gear oil around a couple thousand miles… you’ll see why when you drain it.. FUGLY looking.

Until then, you’ll probably notice a slight whine around 40 - 50 mph.

Royal Purple’s 85w140 GearMax product or RP 75w140. They are around $8/qt. If you can, go with the RP Maxgear 85/140 for the diff.

Get 2 quarts when you buy RP. It takes 1.6 qts if you get all of the old stuff out. Just hand tighten the bolts and give a little torque.

It should be easy to change, you can just crawl under the back end, no need for a jack. Just pull the drain plug and let it drain. Put the plug back in, fill it up with around 0.4 qts to clean the old stuff out, drain it again, plug it, fill it, plug it.

Fuel

92 octane or better, no less than 87 though.

2005 GTO Fluids