2.5 lite engine owners - what fuel do you use?
Discussion
Dear All, I'm interested in knowing what fuel you use in your 2.5 litre engines. Your engine, like mine, should be of standard tune. The reason? I'm trying to get to the bottom of all the naysayers/hearsay re' standard 95RON petrol. There's much duff info' on the net/within the forums. If you use 97-99RON please state specifically why. If you've used 95RON petrol and experienced problems, please indicate. This should make for an informative listing...
Note: please do not reply with forum type hearsay comments, only hard facts, thank you
v8250 - 2006 Forester XT - Sainsbury's UL 95 RON [No problem experienced]
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Note: please do not reply with forum type hearsay comments, only hard facts, thank you
v8250 - 2006 Forester XT - Sainsbury's UL 95 RON [No problem experienced]
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I would never run anything apart from momentum or shell 98. I've just departed from my relationship with Subaru and a 2008 STI due to looming ringland failure. The car was run on these fuels while I had it and I can't vouch for the previous owner but the engine in these 2.5L motors is so fragile I would never consider running it on 95. Once Subaru replace the chocolate EJ25 I'll be a returning customer. I also reckon it's down to luck with these engines so put cash aside for a possible engine failure.
The three N/A 2.5s I've had (still got one) all took 91RON fine. In fact, the 91 stuff we get here is now E10 which means up to 10% of it could be plant-based ethanol. The 2.0T has a big sticker on the inside of the filler flap saying 98RON only, so that's what it gets. No probs from any of them.
I think the recommended fuel for the 2.5T (from 2004'ish onwards) over here is 95RON, though I've spoken with a few others that have always used 98 for their own belief that its better.
I think the recommended fuel for the 2.5T (from 2004'ish onwards) over here is 95RON, though I've spoken with a few others that have always used 98 for their own belief that its better.
- v8250 - 2006 Forester XT - Sainsbury's UL 95 RON [No problem experienced]
- Adingley84 - 2005 Forester 2.5XT - Tesco Momentum 99 RON. 100k miles and runs like a dream
- Adingley84's Mum - 2006 Forester 2.0 N/A - Tesco 95 RON. 70k miles and air punp/valves just went at cost of 2.5k.
Please forgive me if this is too far away from the data you requested, but it might have some relevance for testing.
Having run standard 2.0 WRX on 95 vs 97 and looked at the knock correction tables, I saw no correction when on 97 but timing pulled in some cells on 95. The standard WRX is supposed to run on 95, but I ended up running 97.
If you're interested in some cold hard data from your own car, some of the sub £10 VAG-COM cables + free software will enable you to read the fine/rough learning tables.
Having run standard 2.0 WRX on 95 vs 97 and looked at the knock correction tables, I saw no correction when on 97 but timing pulled in some cells on 95. The standard WRX is supposed to run on 95, but I ended up running 97.
If you're interested in some cold hard data from your own car, some of the sub £10 VAG-COM cables + free software will enable you to read the fine/rough learning tables.
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