95 or 98 petrol - what do you use?

[k4rma]

Bought a new 132 TSI Tiguan. Obviously 95 is the min but wondering if many people opt for 98 instead? Is it worth the price differential? Make much difference to the engine?

[zzc2010]

Are you kidding? Always 98!

[OZROD]

Here are a few youtube videos on this subject.
In this one, they seem to be saying that the move from 95 to 98 makes about 4% difference in pressure (98 allows higher) because the cylinders can advance timing further on 98.
YouTube

In this one seems to show between 1 and 4 additional BHP over standard fuel.
YouTube

Hmmm.

[mickofoz]

Are you kidding? Always 98!

I used to believe more is better and used BP Ultimate exclusively. However, it made no difference in fuel economy and no difference in performance. Yes, BP claim it keeps your engine cleaner but according to the VW service center, there were no visual difference in oil colour and spark plug wear. But as with most premium products, if you want to believe something, you will always argue against other opinions.

[CWolf1]

Costco fuel (red).

[Umai Naa!!]

I'd be more concerned about detonation than fuel consumption and performance.

[Ozsko]

Are you kidding? Always 98!

Why? Lower octane burns faster.

[zzc2010]

Why? Lower octane burns faster.

Purer the better


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[Ozsko]

Give me some hard facts and I might agree.

[tigger73]

You can run into issues of pinging/detonation if you run a lower octane fuel in an engine that is tuned for a higher octane. Particularly at higher ambient temps and higher loads.

On an ongoing basis this can do permanent damage to the engine internals requiring expensive repairs.

Your car is designed to run on 98 fuel so you’re well advised to use it. The sticker on your fuel flap has a large 98 and small 95 meaning you can use a bit of 95 in an emergency but it’s designed to run on 98.

For the cost of a couple of $ a tank it’s not worth the risk of doing damage to your engine.


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