Costco Premium Diesel vs Shell V Power Diesel Octane

[MercedesDriver]

If the quality is superior than shell standard and BP standard then I'm happy.

Only the time and the repair bill will tell.

 

[DSM10000]

How many more "Which diesel / petrol brand is best"does the Forum need?

A simple search and some "research" on here shows that this has been covered innumerable times and every time the conclusion is that all fuel meets a minimum specification and standard and that the only difference is that so called premium fuels have additional additives which "may" help maintain parts of the engine long term.

 

[Dryce]

No, it is not better as explained here:

LOL

So pathetic you get the impression those making the adverts aren't even convinced about what they are selling.

 

[markjay]

How many more "Which diesel / petrol brand is best"does the Forum need?

A simple search and some "research" on here shows that this has been covered innumerable times and every time the conclusion is that all fuel meets a minimum specification and standard and that the only difference is that so called premium fuels have additional additives which "may" help maintain parts of the engine long term.

The reason this keeps coming-up is not because we disagree on the facts... people do understand that when they buy premium fuels they pay for fuel plus additives pack.

And there's no denying that detergents in the fuel are generally good for the engine's intake system.

The reason this keeps coming-up time and time again is because people are asking "is it worth it?"

Well, the simple answer is that it does for some, and it doesn't for others... it's really a question of personal choice.

 

[219]

How many more "Which diesel / petrol brand is best"does the Forum need?

A simple search and some "research" on here shows that this has been covered innumerable times and every time the conclusion is that all fuel meets a minimum specification and standard and that the only difference is that so called premium fuels have additional additives which "may" help maintain parts of the engine long term.

On the contrary , it has been proven that petrol with higher octane rating can increase the performance of certain vehicles , as well as giving more mpg .

While it makes no discenable difference to my 190 , my SL definitely runs better on super unleaded and delivers an extra 20 or 30 miles from a tankful .
My daughter’s Polo 9N , hardly a performance car , does ‘pink’ noticeably under acceleration with regular unleaded ( it is a known characteristic of the 1.4L 16V engine ) but does not do this when super unleaded is used , which is what the handbook says should be used .

 

[DSM10000]

On the contrary , it has been proven that petrol with higher octane rating can increase the performance of certain vehicles , as well as giving more mpg .

While it makes no discenable difference to my 190 , my SL definitely runs better on super unleaded and delivers an extra 20 or 30 miles from a tankful .
My daughter’s Polo 9N , hardly a performance car , does ‘pink’ noticeably under acceleration with regular unleaded ( it is a known characteristic of the 1.4L 16V engine ) but does not do this when super unleaded is used , which is what the handbook says should be used .

I made no mention of differences due to octane rating as I (clearly wrongly) assumed that was a given as "Premium" fuels by definition tend to be those offering the higher octane rating. My comment was clearly about the standards that fuel suppliers must meet.

 

[flowrider]

On the contrary , it has been proven that petrol with higher octane rating can increase the performance of certain vehicles , as well as giving more mpg .

While it makes no discenable difference to my 190 , my SL definitely runs better on super unleaded and delivers an extra 20 or 30 miles from a tankful .
My daughter’s Polo 9N , hardly a performance car , does ‘pink’ noticeably under acceleration with regular unleaded ( it is a known characteristic of the 1.4L 16V engine ) but does not do this when super unleaded is used , which is what the handbook says should be used .

Are you sure? Do VW stipulate super unleaded for a 1.4 Polo? My Audi S5 3.0l supercharged engine only needs 95 ron unleaded as does my 5.0l V8 SL.

 

[219]

Are you sure? Do VW stipulate super unleaded for a 1.4 Polo? My Audi S5 3.0l supercharged engine only needs 95 ron unleaded as does my 5.0l V8 SL.

Yep , quite certain - it's in the handbook .

It surprised me because that kind of car is generally bought by economy minded buyers , and when I went with Gill to look at the car , I walked away because there was this very obvious tappety sounding knocking coming from the engine under acceleration . I joined a couple of owners forums where it was well documented that they do indeed 'all do this' as the guy selling the car had assured me !

Reassured , we went back and bought the car - a year on it hasn't given any trouble and sailed through its MOT in November .

Only it isn't tappets , it is 'pinking' because the car is meant to run on super unleaded , although hardly anyone does . I confirmed this by running the tank as low as I dared then filling it with Tesco Momentum ( which I normally use in my SL ) and the noise stopped within a few miles .

The consensus on the forum was that it does no harm and many people run them on regular unleaded , putting up with the noise , which is what my darling daughter does . Every now and then I treat her to a tank of super unleaded .

 

[GeeJayW]

Even when the manufacturer does not specify the use of premium/super unleaded, some engines perhaps surprisingly are able to benefit from octane higher than 95 RON. VW user manuals that I've read in the past for the 1.4 TSi and 1.6 gasoline engines, have specified the use of 97 RON or higher and warn the user to expect reduced performance and fuel economy if using regular 95 RON.

Also super unleaded from the majors (and Costco too according to their bumph) have more/stronger cleaning performance and will remove existing deposits from injectors and/or inlet valves depending on the fuelling configuration. Meanwhile, in the UK at least, most regular 95RON gasoline fuels have some additives that minimise or even prevent the build up of deposits.

This is similar for diesel where the premium grades have improved qualities associated with the additive pack as compared to regular grades.

 

[flowrider]

Yep , quite certain - it's in the handbook .

It surprised me because that kind of car is generally bought by economy minded buyers , and when I went with Gill to look at the car , I walked away because there was this very obvious tappety sounding knocking coming from the engine under acceleration . I joined a couple of owners forums where it was well documented that they do indeed 'all do this' as the guy selling the car had assured me !

Reassured , we went back and bought the car - a year on it hasn't given any trouble and sailed through its MOT in November .

Only it isn't tappets , it is 'pinking' because the car is meant to run on super unleaded , although hardly anyone does . I confirmed this by running the tank as low as I dared then filling it with Tesco Momentum ( which I normally use in my SL ) and the noise stopped within a few miles .

The consensus on the forum was that it does no harm and many people run them on regular unleaded , putting up with the noise , which is what my darling daughter does . Every now and then I treat her to a tank of super unleaded .

Go to know thanks. I was thinking of getting my wife a Polo but now I don't think I will!

 

[219]

Go to know thanks. I was thinking of getting my wife a Polo but now I don't think I will!

AFAIK its not every engine in the range , but worth checking if looking seriously at one .

 

[ph47mf]

I would be more concerned with small details like fuel quality if I was driving an exotic car of some kind. At the moment, as long as the engine runs, it's good enough for me.