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Is it unusual for ’99 XC to burn an exhaust valve at 160,000 miles? V70-XC70 1999

posted by  Hugh on  Thu Feb 26 08:50 CST 2015
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last visit: Fri Oct 24 09:47 CST 2014
[RELATED]

Jim,

I don’t have the owner’s manual in front of me, but I suspect the engine requires 91 Octane. If using regular (87 Octane) is the cause of my problem, then I am the “villain”. Since I purchased this car back in 1999 with 12,000 miles, I have run it on 87 Octane. Sometime in 1998 or 1999 I attended an Open House of Volvo’s headquarters in Rockleigh, NJ. At that time there was a Volvo engineer present who said that although the owner’s manual recommended 91 Octane for Volvo 850s and the then new XC (I think), you could use 87 Octane without damaging the engine. Knock sensors in the engine would compensate for the lower octane, and you might get fewer miles per gallon and your car might be less peppy.

Since that time I’ve run my two ’96 850s (non-turbo) and my ’99 XC on 87 Octane without incident, until now. If 91 Octane is required for the XC to avoid burned valves, then this problem may have been caused by me.


Hugh






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