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The 2010 Jeep Wrangler range of configurations is currently priced from $10,990.
Our most recent review of the 2010 Jeep Wrangler resulted in a score of 3.5 out of 10 for that particular example.
You can read the full review here.
This is what Ewan Kennedy liked most about this particular version of the Jeep Wrangler: Can take you places other 4WDs can't, Quieter than its predecessors, More stable than earlier models
The 2010 Jeep Wrangler carries a braked towing capacity of up to 2300 Kg, but check to ensure this applies to the configuration you're considering.
The Jeep Wrangler is also known as Jeep YJ, Jeep TJ, Jeep JK, Jeep JL, Jeep J8 (Military version), Jeep Saharam, Jeep Willys (Iceland), Jeep CJ5, Jeep CJ7, Jeep Wrangler Unlimited in markets outside Australia.
There's no reason to be putting oil in the gearbox, so the oil should still be the original factory fill. If you want you could drain a sample of the oil and have it analysed to identify what it is. I suspect the problem is related to its heavy off-road use rather than the wrong oil being used.
As you have tried all avenues open to you, the dealer, the manufacturer and the consumer affairs people, the only course left open to you is to take direct legal action. Before you do, however, I would suggest you go back to the dealer and ask to see a representative from Jeep so you can sit down and discuss your concerns face to face.
The Jeep Wrangler 2010 prices range from $8,690 for the basic trim level SUV Unlimited Rubicon (4x4) to $19,910 for the top of the range SUV Unlimited Sport (4x4).