95 or 98 petrol - what do you use?

[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.


Sent from my iPhone using Tapatalk

[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.


Sent from my iPhone using Tapatalk

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.

[tigger73]

I know the dealers will tell you to only run on 98.

Check your fuel filler flap and owners manual.

If you have a sticker like this it means run on 98 and 95 in an emergency until you can fill with 98.




Sent from my iPhone using Tapatalk

[doc_777]

Not all stickers are the same. My wife’s car says 95. Some models are tuned for 98, some are tuned for 95. There is no consistency within VW on this issue, because different engines in the same family are used in different vehicles.

We should also be consistent when referring to RON, as ‘octane’ is a different rating. VW Aus refers to RON when specifying which fuel to use.

98RON will often be specified on higher performance models in the VW range, whereas standard models will often specify 95. 95RON is the standard fuel in mainland Europe - referred to as ‘Premium’. ‘Super Premium’ is 98RON.

Those who think that just because their vehicle has a sticker stating 98RON is required must mean all VW’s require 98 are simply incorrect in their assumption.

[The_Hawk]

Since about 1999 I have run every car I've owned on 98 (had leaded cars before that). My wife had a habit of putting 91 into our '95 Mazda and '01 Hyundai in the early days but I did some tests in both and showed that both were break even at worse thanks to better fuel consumption figures with higher octane fuel. I also assume that better quality fuel is just better for the engine and that was essentially coming for free. So while I showed that it did cost more to fill the tank, the lower consumption meant you did it (slightly) less often.

What's your source on this? I had two work colleagues, one with a Jetta and one with a Golf. Both ended up with a check engine light, rough running and a diagnosis of cracked pistons. They did not use 91 octane fuel.

My twincharger has run it's entire life on 98 and broke it's piston at 30,000km. They just seem to do that regardless of what you do to them... that said pinging that particular engine due to poor fuel is extra extra not recommended.

[dptiggie]

Seems opinions are divided. Just wondering if I can reliven this thread with a poll- to see if one is more popular. Who on a 162 TSI is running 95 vs 98? I’ll tally up every so often.

[spacemannz]

162tsi = 98 for me.
No science around My decision, it just seems a safe bet and not a great cost on every fill.

[Pzero]

95. Runs perfectly fine, and punchy.

[sharp]

I fill them both randomly. No noticeable difference whatsoever.

[braddersnz]

98, no science..

[anonymousmoose]

98 Ron BP usually. Fill it up on (WA) cheap fuel Mondays saving up to 20c a litre.

[adrianb]

162TSI that only sees BP 98 RON in Melbourne here.