unleaded fuel in XJ-SC V12

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MrV8

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Joined:Mon May 04, 2015 3:22 pm
unleaded fuel in XJ-SC V12

Postby MrV8 » Thu Sep 21, 2017 3:44 pm

I have a 1986 XJ-SC 5.3 V12 with just under 50,000 original miles in the clock, looked after by Swallows in Rooksbridge. I've never asked the question about running it just on unleaded. I use Shell V-Power nitro and no lead additive. Is this best practice or should I be using lead additive either periodically or constantly?? With the old girl having made it this far in life, I don't want to run the risk of damaging the gorgeous V12 engine!
Brakebuster
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Re: unleaded fuel in XJ-SC V12

Postby Brakebuster » Thu Sep 21, 2017 7:03 pm

no lead additive required at all

the engine is designed to run on unleaded fuel ,

BB
1989 5.3ltr V12 XJS Coupé FULLY RESTORED
2015 2.2TD Sportbrake in BRG and black leather
1994 3.2S XJ40 in Morocco Red with Doeskin interior

old cars
1999 4ltr Sovereign XJ8
2004 X-Type
davidr

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Re: unleaded fuel in XJ-SC V12

Postby davidr » Thu Sep 21, 2017 7:07 pm

As BB says, all XJS's were built to run on unleaded fuel so nothing to worry about. I find that mine are happier with super unleaded but will run perfectly effectively on normal unleaded.
XJS FORUM COORDINATOR
1996 XJS Celebration Convertible 2001 XKR Convertible

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1989 XJ-S V12 Coupe. 2006 XJ TDVi Sovereign. 1995 XJ6 3.2. 2013 XF 2.2d. 2009 X Type 2.0d Sovereign estate
MrV8

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Joined:Mon May 04, 2015 3:22 pm

Re: unleaded fuel in XJ-SC V12

Postby MrV8 » Thu Sep 21, 2017 7:23 pm

Thanks very much for your quick replies. I feel a lot better now!
Andrew
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