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POLL What octane gas is everyone using?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

What octane gas are you using? (US... vs. RON)

<= 84. If you're outside US/Canada -> 88 RON NON-US
0
No votes
85. If you're outside US/Canada -> 89 RON NON-US
0
No votes
86. If you're outside US/Canada -> 90 RON NON-US
0
No votes
87. If you're outside US/Canada -> 91 RON NON-US
7
23%
88. If you're outside US/Canada -> 92 RON NON-US
0
No votes
89. If you're outside US/Canada -> 93 RON NON-US
2
6%
90. If you're outside US/Canada -> 94 RON NON-US
1
3%
91. If you're outside US/Canada -> 95 RON NON-US
10
32%
92. If you're outside US/Canada -> 97 RON NON-US
1
3%
93. If you're outside US/Canada -> 98 RON NON-US
10
32%
94. If you're outside US/Canada -> 99 RON NON-US
0
No votes
=> 95. If you're outside US/Canada -> 100+ RON NON-US
0
No votes
 
Total votes: 31

Sommerfeldt
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Re: what octane gas is everyone using?

Post by Sommerfeldt » Tue May 19, 2015 5:16 pm

mnorris23 wrote:I had to drop back to unleaded because I couldn't afford it.
I hope you're always running unleaded, no matter the octane, buddy. :shock:

I run 95 or 98 all the time - not surprising, I suppose, since that's all we have over here, like the Swede earlier in the thread. :) Never had knocking or pinging or whatnot in any of my (relatively high-mileage) Volvos.

- S


'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.

Eddienorgard
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Eddienorgard

Re: what octane gas is everyone using?

Post by Eddienorgard » Thu May 21, 2015 11:11 pm

I use 87 octane usually! When I use 91 or 93 I notice a slightly smoother drive but nothing crazy good lol



instarx
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Re: what octane gas is everyone using?

Post by instarx » Fri May 22, 2015 6:42 am

chrisjm91 wrote:I drive a 95 850 turbo with about 100k miles on it and just recently switched to 93 after reading up on octanes. I have to say I've noticed a little bit smoother engine. Just wondering if I'm crazy or if other volvo enthusiasts are running 93 octane in the turbo models volvos, as well as N/A.......
I use 93 octane. In my area I only have the choice between 87, 89 and 93. Until about 2 years ago I only used 87 octane, thinking higher octane was a waste of money. Was I ever wrong! I posted the data I collected through about six full tanks with either 87 or 93 octane in them here on MVS. You do get improved mileage with octane over 91, and therefore more miles per tank. Although it costs more at the pump, the improvement in MPG almost exactly balanced out the cost. We're talking a big improvement - about 30 extra miles per tank. These particular cars are set up to run most efficiently using 91+ fuel. That post should still be here somewhere.

Trust me on this - I am a meticulous person when it comes to measuring MPG accurately - these were real improvements and not wishful thinking.


2000 V70XC SE - 184k miles... busted
2011 XC60 - 66K miles... the big blue marshmallow

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erikv11
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erikv11

Re: what octane gas is everyone using?

Post by erikv11 » Fri May 22, 2015 7:18 am

+1 on that point, several people have posted that same observation about mpg.

The real point is the longevity of the engine internals. As has been beaten to death here and on other forums, over the long haul the engine is much more likely to burn an exhaust valve when running the lower octane fuels. Burnt valves are showing up more and more these days ...


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

tryingbe
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tryingbe

Re: what octane gas is everyone using?

Post by tryingbe » Fri May 22, 2015 11:09 am

Modern fuel injections engines have knock sensors to detect knocks to save the engine. If you use lower octane gas, the engine will probably knock on acceleration, computer will see the knock and pull timing, this is why power/mpg goes down.

Use whatever the factory recommended, which is usually 91 octane for turbo car. If you can't afford 91 octane, you can't afford a turbo car.


85 GLH, 367 whp
00 Insight, 72 mpg

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osman
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Re: what octane gas is everyone using?

Post by osman » Sat May 23, 2015 6:41 pm

Run 87 in a turbo long enough and you will burn valves, I promise. 92 or NA.


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erikv11
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erikv11

Re: what octane gas is everyone using?

Post by erikv11 » Sun May 24, 2015 9:43 am

osman wrote:Run 87 in a turbo long enough and you will burn valves, I promise. 92 or NA.
This.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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abscate
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Re: what octane gas is everyone using?

Post by abscate » Tue Jul 02, 2019 4:16 am

Old thread, note that posters in EU report their octane on a scale that is 4 points higher than a North America.

So, when Swedish poster says s/he is running 97 octane it’s equivalemt to a US 93 octane.

Higher octane fuel has slightly less fuel value than regular gas, about 3%

Differences in mileage reported of less than 5% are usually in the envelope of measurement noise.


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Rattnalle
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Re: what octane gas is everyone using?

Post by Rattnalle » Tue Jul 02, 2019 4:30 am

abscate wrote:
Tue Jul 02, 2019 4:16 am
Old thread, note that posters in EU report their octane on a scale that is 4 points higher than a North America.

So, when Swedish poster says s/he is running 97 octane it’s equivalemt to a US 93 octane.

Higher octane fuel has slightly less fuel value than regular gas, about 3%

Differences in mileage reported of less than 5% are usually in the envelope of measurement noise.
Regular over here is RON95 which is about equivalent to 89-90 in your end. But even on the euro scale the Swedish instruction booklet for the P80 says that as low as RON87 is OK to use at least for the NA though not recommended.

Octane isn't the only fuel quality parameter though.



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Goupil
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Re: what octane gas is everyone using?

Post by Goupil » Tue Jul 02, 2019 12:54 pm

Mine is currently running on a mix of E85 and RON 95-E10. Simple reason being that E85 is at least half the price of 95, sometimes a third.
LTFT is at 20% which sounds legit and I get a 20% worse mpg, but still make it cheaper to keep the brick on the road


1998 Volvo V70 B5254T manual 193hp - 319 000 km

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