Jaguar XJ6 series III 1985 62,000 miles 4.2 litre

1985 JAGUAR XJ6
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ROBERTJEFFERSON
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My Jaguar has a problem with sticking valves. I only drive it from April to October and it is garaged all winter. I have put 6,000 miles on it the last 4 years and I have done 3 valve jobs! Just yesterday I removed the valves and found 3 bent exhaust valves and two bent intakes.The valve stems seemed dry. I use Mobil I 15-50 oil, only use 93 octane fuel. The problem seems to arise when I take the car out of winter storage. Any suggestions on how to prevent this or what is causing it?
Aug 14, 2007 at 7:51 AM
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JAMES W.
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15-50 sounds a little heavy for average driving.
Have you tried any of the after market polymer oil enhancers?
Oct 5, 2008 at 2:37 PM