95 or 98 petrol - what do you use?

[Umai Naa!!]

How do you amortise an engine rebuild over the year, should you fill up on a slightly different batch of 95 on a hot day?

[Berlina]

Shell V-Power only - 98 - for me

[ewok666]

Shell V-Power only - 98 - for me

BP98 only. On a stage 1 tune you want the best 98 and every tuner swears by BP98. If they still had 102 the. I’d be getting that.

Without a tune I doubt there would be much difference between 95 and 98.

[Ozsko]

95RON is still borderline in them, even when they've had the re-flash done on the ECU to knock the edge off the timing.

I'd strongly recommend 98RON only, in TSI motors.

Why do you say that? Do you know more than VW who design the motor and spec 95? I would be interested in the facts behind the statement. It is like people reckon that 15 thousand km oil changes are too long, again with no proof to back it up. Personally I have never used 95 except on one occasion out in the bush where it was forced on me because where I buy my fuel from they don't have it.

[Umai Naa!!]

I'll take my 10+ years with the product in a workshop environment, and leave shall I?

[Ozsko]

You reckon that is better that all the years and experience and R&D that VW put into manufacturing cars. I see statements like you made and wonder what you know that VW does not. Sure if you have some solid evidence than trot it out.

[Umai Naa!!]

Back up your counter claims

[Ozsko]

I haven't made any, you said 95 was marginal so explain why with some proof. All I asked was why and do you have more knowledge than VW who designed and made the motor.

[tigger73]

You can get pinging/detonation running fuel with lower octane rating. At higher ambient temperatures and at higher engine loads is generally worst case. There’s only so much the ECU can compensate for by pulling timing advance.

I have personally experienced this running lower octane fuel (Caltex/Vortex fuel is known to have lower octane than other brands). I’ve had to have my car retuned to run on this fuel.

The engines are designed to run on 98 octane fuel. Run anything less at your own risk.


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[Ozsko]

You can get pinging/detonation running fuel with lower octane rating. At higher ambient temperatures and at higher engine loads is generally worst case. There’s only so much the ECU can compensate for by pulling timing advance.

I have personally experienced this running lower octane fuel (Caltex/Vortex fuel is known to have lower octane than other brands). I’ve had to have my car retuned to run on this fuel.

The engines are designed to run on 98 octane fuel. Run anything less at your own risk.


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I know all about detonation, I raced two strokes and used data logging to count dets for years. The motor is clearly not designed to run 98 and nothing else if you read the owners manual and the fuel placard on the filler cover, either that or VW made a mistake and put the wrong information out there. I am saying that a statement was made that 95 is marginal, please show me why the statement was made with some hard facts. Are you also saying that VW don't know as much as you? You may well b correct but I haven't seen any hard evidence as yet. In your opinion 98 is the minimum, VW do not seem to share that opinion.