Unfortunately, there is no alternative to the Versatrac lube from the dealer.
The capacity is 2.1 quarts and at $25 for a 16 oz. bottle, you're going to spend $100+. (And GM wonders why they are in trouble)
From the factory manual:
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In the event a spare wheel of a smaller diameter is used on any of the four positions, the wheel rotational speed difference is detected by the wheel speed sensors of the anti-lock brake system (ABS) system. The powertrain control module (PCM) directs the clutch pump check valve to close and block oil flow to the gerotor pumps. The clutch pump check valve also monitors the sump oil for an over-temperature condition. If differential oil temperature exceeds 110°C (230°F), the valve will close and block oil flow to the gerotor pumps. In both spare wheel usage and over-temperature conditions, a "closed" valve will alert the PCM to illuminate the control panel "AWD Disable" light.
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From personal experience, a difference in tread depth on the tires can also trigger the light. All 4 tires had equal tread and were about half worn. I had to replace 1 rear with a new tire and that triggered the light. By replacing the other rear tire so the treads matched, the light extinguished.
I have spoken to another person who had a wheel bearing "growl". The "growl" appeared to have caused interference with the ABS signal and triggered the Disable light.
From the factory diagnostics:
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Factors that may contribute to an inoperative rear differential include: - Differential inoperative due to antilock brake system (ABS) function
- Inoperative powertrain control module (PCM) and/or wiring system
- A mini spare or different size tire installed
- A fluid over-temperature condition
- An inoperative or "stuck" clutch pump check valve
- A defective rear differential assembly
- An inoperative transfer case assembly
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A dealer or independent shop with the appropriate scan tool can retrieve codes related to the Disable light. It may be worthwhile to have those codes read to have a good starting point.