Driving so low to the road, I have a personal distain of all SUVs. The XC90 with the twin turbo is not on my favorite list if I had to have an SUV. The 6 cylinder engine is prone to heat damage and adding 2 turbos to the engine compartment doesn't help. Volvo stopped making the T6, I wonder why?
No, one turbo failure does not mean the other will fail. The turbos do not talk to each other. Usually, a turbo seal will last for 150K+ miles, if the engine compartment can dispell heat. Getting a turbo rebuilt costs around $350 + core, the dealer asks for much more because they only deal in new parts.
Your CAT is just fine. A little oil will not hurt it. And oil in the muffler will just burn out anyway. Not to worry.
The premature failure of the turbo should be reported to the Volvo regional rep, perhaps Volvo will help with the replacement cost if the SUV is no longer under warranty.
Klaus
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