[ant1sec]

Starting with the SPA vehicles, even the T5 requires 91 octane or higher. In fact, the manual wording has changed to "Volvo demands premium fuel (91 octane or higher) for all T5, T6 and T8 engines". This suggests that they modified the software programming to need this. Pretty certain that if evidence is discovered of neglect of a vehicle against manufacturer requirements, that your warranty would be affected.

What bothers me more with this statement, is that the Harvard comma is missing after "T6".

 

[Tech]

It isn't because of some software change. It's because of an engine change- the Drive-E being direct injection whereas previously Volvo did not use direct injection.

 

[Mikey54]

Starting with the SPA vehicles, even the T5 requires 91 octane or higher. In fact, the manual wording has changed to "Volvo demands premium fuel (91 octane or higher) for all T5, T6 and T8 engines". This suggests that they modified the software programming to need this. Pretty certain that if evidence is discovered of neglect of a vehicle against manufacturer requirements, that your warranty would be affected.

What bothers me more with this statement, is that the Harvard comma is missing after "T6".

Argh! Whoever started putting a comma before "and" should be shot...figuratively of course.

 

[ant1sec]

It isn't because of some software change. It's because of an engine change- the Drive-E being direct injection whereas previously Volvo did not use direct injection.

T5 Drive-E engines prior to SPA allowed regular. The wording was:

"Volvo recommends premium fuel for best performance, but using 87 octane or above will not affect engine reliability."

 

[Tech]

That is the wording they have used for years in the prior engines that did not require 91 (before Drive-E).

I'll admit, I didn't check the owner's manuals right away when they came out, but I do specifically remember when I was in class for that engine and we were told it would require 91. This was before the engine was out. Perhaps they forgot to account for those engines in the owner's manual initially, but it looks like they are updated now.

 

[Bsparky16]

Says that for me as well

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So I stopped by this particular Sunoco station and it does sell 90 octane, E0 gas. Apparently this is a thing: I had no idea. Now I've gone down the rabbit-hole into a world of ethanol vs. non-ethanol, premium vs. non-premium , top-tier vs. generic. It's all a blur.

What I can say is that I'm testing out 3/4 tank of 90 E0 (other 1/4 is 93 E10) and from the small sample size I have, throttle and power response seems snappier in Comfort mode (pure butt-dyno testing) and my MPG is hovering around 22 (up to 26 at one point) whereas I struggled to get above 20 (at all) on the previous 3 tanks. Obviously this could be for any number of reasons.

Should I be worried that the E0 is only 90 octane? There isn't any higher octane E0 gas unless I really want to make a detour.

 

[Tech]

That is the wording they have used for years in the prior engines that did not require 91 (before Drive-E).

I'll admit, I didn't check the owner's manuals right away when they came out, but I do specifically remember when I was in class for that engine and we were told it would require 91. This was before the engine was out. Perhaps they forgot to account for those engines in the owner's manual initially, but it looks like they are updated now.

Just checked the paper copy of the manual for a 2015 XC60 I am working on, and the part about the Drive-E engines requiring 91 is in there.

 

[ant1sec]

Just checked the paper copy of the manual for a 2015 XC60 I am working on, and the part about the Drive-E engines requiring 91 is in there.

Interesting. I assume you're referring to the text that states "Vehicles equipped with the high performance 4-cylinder engines (B4204T9 and B4204T10) require premium fuel.". I asked my service desk if this applied to my S60 T5 Inscription, and they said it wasn't affected by this notation. It's pretty confusing when the manual references engine model numbers rather than just stating T5, T6, Polestar, etc.

 

[Tech]

Yep, that's the part. Those are Drive-E engines. I agree, it can be confusing, especially since T5 doesn't automatically mean 5 cylinder anymore. But on the other hand, it does specifically say "4-cylinder" and not just use the B4204T9/10 designations.

 

[gunshow]

If you have a Drive-E engine, premium IS required. Required. Not recommended.

Failure to use premium can damage a Drive-E engine. Haven't run into it yet, but I'm sure I will in time. I'm curious to see how warranty is handled for someone neglecting the car but it probably won't end favorably for them.

It is openly stated that 91 octane is required. No where does it state that failure to use 91 will not cause engine damage.

Look at a manual from a non-Drive-E car. It says 91 is recommended but 87 will not damage the engine.

Now go look up what octane means, why certain engines require certain octane ratings and the damage that can occur for failing to follow requirements.

Stop wasting your time.
:facepalm:

I have tried to explain the scientific reasons why and then explained how we can find out by resetting adaptives and road testing for the awesome detonation rattle prior to engine retardation.

 

[GrecianVolvo]

This thread is beyond ridiculous.

Time to lock it up; in the meantime, you have TWO choices:
1. follow Volvo's guidance
2. save two bucks or so per tankful and do your own thing

 

[Putertech]

This thread is beyond ridiculous.

Time to lock it up; in the meantime, you have TWO choices:
1. follow Volvo's guidance
2. save two bucks or so per tankful and do your own thing

I wish there was a like button

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