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Is it worth using super unleaded in a Plus 4? #557565
03/02/19 07:48 AM
03/02/19 07:48 AM
Joined: Dec 2018
Posts: 902
North of Stamford, UK
HeadlessBlue Offline OP
Talk Morgan Regular
HeadlessBlue  Offline OP
Talk Morgan Regular

Joined: Dec 2018
Posts: 902
North of Stamford, UK
Have tried searching to see if discussed before but couldn’t find it.
I know it has higher octane content compared to normal petrol and supposedly other additives to keep engine clean but is it worth the extra cost? Do you get any better performance overall that a duffer like me would notice?
Thanks
HB


Awaiting Plus Four, prev 110 Plus 4 - “Florence”
Tesla Model 3 AWD LR - “Ernie”
A3 S Line
Re: Is it worth using super unleaded in a Plus 4? [Re: HeadlessBlue] #557567
03/02/19 08:03 AM
03/02/19 08:03 AM
Joined: Jul 2015
Posts: 529
Reading
Rob Thornton Offline
Talk Morgan Regular
Rob Thornton  Offline
Talk Morgan Regular

Joined: Jul 2015
Posts: 529
Reading
I seem to remember others have commented about the relative ethanol contents of different grades. Personally I always use the higher octane or 'ultimate' ranges of both diesel and petrol as I have convinced myself that they offer better mpg and performance. As all my mileage is nearly all for pleasure these days and is relatively low for both my cars the extra cost is not really a factor in my choice though.


Rob T
2001 Royal Ivory Plus 8
Re: Is it worth using super unleaded in a Plus 4? [Re: HeadlessBlue] #557568
03/02/19 08:04 AM
03/02/19 08:04 AM
Joined: Apr 2016
Posts: 1,566
NE Scotland
ewn Offline
Talk Morgan Enthusiast
ewn  Offline
Talk Morgan Enthusiast

Joined: Apr 2016
Posts: 1,566
NE Scotland
Absolutely, the car will feel twice as good.

Just the same as when you buy perfume for your wife, the most expensive ones work far better than the knock offs which smell exactly the same.

Re: Is it worth using super unleaded in a Plus 4? [Re: HeadlessBlue] #557570
03/02/19 08:18 AM
03/02/19 08:18 AM
Joined: Aug 2017
Posts: 106
Staffordshire UK
Calypso Red Offline
L - Learner Plates On
Calypso Red  Offline
L - Learner Plates On

Joined: Aug 2017
Posts: 106
Staffordshire UK
Not really relevant to you but I have found the super unleaded gives better performance in my trad +8. There is a stretch of road near us with a gradual incline. With my foot to the floor standard petrol results in knocking. With super there is no knocking, it just flies! May be I could get the same result by tinkering with the timing but it is easier to 'pump the super'


Calypso Red
1994 +8 BMW Calypso Red.
2002 4/4 4 seater BMW Calypso Red.
Re: Is it worth using super unleaded in a Plus 4? [Re: HeadlessBlue] #557571
03/02/19 08:18 AM
03/02/19 08:18 AM
Joined: Jan 2009
Posts: 4,965
howard Offline
Part of the Furniture
howard  Offline
Part of the Furniture

Joined: Jan 2009
Posts: 4,965
Depends on the engine in the car, but if its a modern one then it will have anti knock sensors which will allow you to use the normal 95 octane stuff. Many magazine tests have shown the benefits of the hiugher octane fuel in a modern engine not specified to require higher octane to be marginal or non existant

Re: Is it worth using super unleaded in a Plus 4? [Re: ewn] #557575
03/02/19 08:32 AM
03/02/19 08:32 AM
Joined: Sep 2011
Posts: 13,774
Mandello del Lario
Gambalunga Offline
Member of the Inner Circle
Gambalunga  Offline
Member of the Inner Circle

Joined: Sep 2011
Posts: 13,774
Mandello del Lario
I always use a premium diesel because with my previous car, which did not have a particle filter, I had noticed much less black smoke on hard acceleration. In fact I had complained to the dealer about the smoke under acceleration and was told "They all do that". My preferred diesel is Q8 Hi-Q and other than a cleaner exhaust I think I get a slightly better consumption. Given the obviously cleaner emissions I have even wondered why this grade of diesel is not obligatory for diesel cars.

For the Morgan I often use the premium super but I really don't notice that much difference. I generally avoid the E10 petrol which is commonly available in France but I do occasionally use the E5 fuel which is available locally.

I am convinced that high ethanol fuels are not really suitable for use with older components, such as fuel lines etc, that where not manufactured to be resistant to ethanol.


Peter

[Linked Image]
Re: Is it worth using super unleaded in a Plus 4? [Re: HeadlessBlue] #557579
03/02/19 08:41 AM
03/02/19 08:41 AM
Joined: Sep 2014
Posts: 2,176
YORK
KEVFITZ Offline
Talk Morgan Expert
KEVFITZ  Offline
Talk Morgan Expert

Joined: Sep 2014
Posts: 2,176
YORK
Absolutley...only use super unleaded in my P4SS.

In my previous 4/4 Sigma engine after having the ECU remapped by Cain of Wolf Performance the engine used to "pink" on normal unleaded but this was cured by using super unleaded.

It also made a noticeable difference pre remapping on acceleration and drivability.

So yes ...your favourite car will thank you for using the best !!!


" I LOVE THE SOUND OF THROTTLE BODIES IN THE MORNING " (ROBERT DUVAL IN "APOCOLYPSE NOW " )
Re: Is it worth using super unleaded in a Plus 4? [Re: HeadlessBlue] #557584
03/02/19 09:09 AM
03/02/19 09:09 AM
Joined: Aug 2013
Posts: 13,147
Salisbury, UK
Peter J Offline
Formerly known as Aldermog
Peter J  Offline
Formerly known as Aldermog
Member of the Inner Circle

Joined: Aug 2013
Posts: 13,147
Salisbury, UK
As has been said, any car engine with knock sensors and an adaptive ECU will benefit from a higher octane fuel. Also, higher octane fuels have better additives which help keep the fuel system clean: this is very important with cars that have throttle body injection.

The fuel info in the AMG suggests 98 Octane. The handbook states that both 95 and 93 Octane may be used, but there will be a loss of performance.

The BMW doesn't seem to care, so it gets 95 Octane and the Morgan gets premium unleaded.

On the old E Coupe, which had a 3.0L Diesel using premium diesel gave a 10% improvement in fuel economy. No idea why.


Peter,
V8s are best....
Tarka the 'Otter Mog....2014 Plus 8
AMG C63 Estate.


Re: Is it worth using super unleaded in a Plus 4? [Re: Rob Thornton] #557588
03/02/19 09:49 AM
03/02/19 09:49 AM
Joined: Apr 2008
Posts: 9,316
Gloucestershire, UK
Hamwich Offline
Needs to Get Out More!
Hamwich  Offline
Needs to Get Out More!

Joined: Apr 2008
Posts: 9,316
Gloucestershire, UK
Originally Posted By Rob Thornton
I seem to remember others have commented about the relative ethanol contents of different grades. Personally I always use the higher octane or 'ultimate' ranges of both diesel and petrol as I have convinced myself that they offer better mpg and performance. As all my mileage is nearly all for pleasure these days and is relatively low for both my cars the extra cost is not really a factor in my choice though.


+1


Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 1957 R4 CV, 2005 Ferrari Vipar
Re: Is it worth using super unleaded in a Plus 4? [Re: HeadlessBlue] #557590
03/02/19 10:02 AM
03/02/19 10:02 AM
Joined: Jun 2014
Posts: 11,321
Lancashire, England
Stewart S Offline
Wave & smile... It's a Morgan
Stewart S  Offline
Wave & smile... It's a Morgan
Member of the Inner Circle

Joined: Jun 2014
Posts: 11,321
Lancashire, England
Like others I always try to put premium fuel in the Mog

And I try to always fill up with Shell’s super unleaded because one of my best friends designs petrol filling stations and he told me a few years ago that only Shell stations in the uk have the best moisture free tanks


2008 XXVII Platform, Bugatti Blue Roadster 4 Seater
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