I've not heard of a petrol engine that can't be run on LPG, but perhaps there are some out there. The use of a valve lubricant such as FlashLube should ensure no issues with excessive valve wear. I've got the 3.2 SI6 engine in my XC70 which runs very happily on gas although I have no info on whether it was used in the XC60 model too.
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2008 XC70 3.2 SE Lux with LPG conversion - current
2005 XC70 D5 SE Lux - sold
2004 XC70 D5 SE Lux - written off by another XC70
2001 V70 D5 - sold
2000 V70 Classic 2.4 - sold
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