MorganExp

Morgan +8 Forum

Fuel grades for 3.9 engine

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MrToad Chris Coote
Brixham, Devon, UK   GBR
What grade of unleaded fuel have people found best on this relatively low stressed engine? all it says on the car is "unleaded only". Some engine management systems have better anti knock arrangements than others. Do these engines go better on super unleaded (97 octane)?

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davewhite Dave White
ARCATA, CA, USA   USA
The owners manual for my 2003 Plus 8 recommends 95 to 98 octane. I have always run premium.

Dave

GR08MOG Geoff Roberts
Lindfield, West Sussex, UK   GBR
In 22 years with a Plus 8 I used both. No knocking but premium 'felt' better, and with a relatively small mileage the cost difference was insignificant.

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Morgan13 Timothy Barlow
Vancouver, WA, USA   USA
I have a 4.0 in the +8 and I always use the best premium gas I can find in both my Morgans. Why would you want go cheap?

2013 M3W
Morgan stage ll motor kit

1998 +8
SS sport tuned exhaust

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