Do you use regular or premium? LTG engine.

[Regal11]

I use 93 octane in mine since that's what's recommended by GM

 

[FavaBean]

@Ben Daigneault - Just to be clear for all...

Since GM recommends and not requires premium for the 2.0T.... IF you owned the 2.0T engine, what octane would you run? And would that octane choice change if you were seeking peak performance?

 

[Hunter Mike]

If it's retarding timing, knock is occurring and it's damaging your engine. In other words, it's too late to apply the brakes once you have crashed into the car ahead of you, the damage is done.

nope, the knock sensor is detecting the onset of ping and retards the timing instantly, no damage done. In other words, it‘s like AEB, the system senses an object in front of you and brakes for you.
The LTG has a base tune for 87R+M/2...it can advance base timing to take advantage of higher octane. Even with 93 octane it pulls timing if the knock sensor perks it’s ears up.

 

[BenD]

@Ben Daigneault - Just to be clear for all...

Since GM recommends and not requires premium for the 2.0T.... IF you owned the 2.0T engine, what octane would you run? And would that octane choice change if you were seeking peak performance?

@Ben Daigneault - Just to be clear for all...

Since GM recommends and not requires premium for the 2.0T.... IF you owned the 2.0T engine, what octane would you run? And would that octane choice change if you were seeking peak performance?

I have the 3.6 and using regular gas 87 and as the owner manual describe, recommended for the 2.0 of 93 and 87 can be use but if knocking occured, use 93.

 

[BenD]

nope, the knock sensor is detecting the onset of ping and retards the timing instantly, no damage done. In other words, it‘s like AEB, the system senses an object in front of you and brakes for you.
The LTG has a base tune for 87R+M/2...it can advance base timing to take advantage of higher octane. Even with 93 octane it pulls timing if the knock sensor perks it’s ears up.

both of you are right in a certain way! Thank God we have knocking sensor to avoid damages but without that sensor, damages can occurred

 

[BoostedRegal2.0]

nope, the knock sensor is detecting the onset of ping and retards the timing instantly, no damage done. In other words, it‘s like AEB, the system senses an object in front of you and brakes for you.
The LTG has a base tune for 87R+M/2...it can advance base timing to take advantage of higher octane. Even with 93 octane it pulls timing if the knock sensor perks it’s ears up.

A knock sensor can't predict knock, it senses knock when it's occurring. Read this info I found:

The knock sensor detects vibrations that come from a knock or an irregularity in combustion and send a signal to the engine control computer, which then adjusts timing to correct the knock.

Hmmm just like I said, knock has to occur for the system to retard timing.

 

[GermyShoe]

Oh, Jesus. Not this again. Soooo many posts about this throughout the board.

 

[Ctrcbob]

Sorry. Is for LTG.

I use Shell Premium because of the "extra" cleaners in the Premium, plus I get it discounted using "T-Mobil Tuesdays".

 

[BenD]

I use Shell Premium because of the "extra" cleaners in the Premium, plus I get it discounted using "T-Mobil Tuesdays".

Mobil should have Synergy which is much better !!

 

[Zeroboostbuick]

I wouldn't recommend 87 on a hot day, but it works fine. If you never go full throttle, you'll be fine with 87 when it's not hot outside.

I run 91+ cause I abuse my cars.

 

[BenD]

I wouldn't recommend 87 on a hot day, but it works fine. If you never go full throttle, you'll be fine with 87 when it's not hot outside.

I run 91+ cause I abuse my cars.

Why when it’s hot?? Are you referring to high and low volatility?

 

[D2R]

Search keyword: Premium
Searched forum: This forum
The following are what I found from the first 8 pages.
(Well...at least, none of them have a poll...)

87 vs 93 - the Definitive thread

I'm really not trying to be snarky, but here are several threads discussing 87 vs 93 Octane. It would be nice if there were a way to pin this to the top of the forum. Who's using Hi-Test or Premium Fuel 93 Octane TourX and Regal 2018 2019 Need Premium Fuel? Does TourX actually get better...

buickforums.com

87 octane with 2.0 turbo

Hello my father just picked up his regal with the 4 turbo and I noticed the gas door states premium recommended and he is so old school I know he’s not going to want to put premium in I feel horrible because I pushed this car for him instead of the lacrosse with the v6 Who has been using 87...

buickforums.com

Who's using Hi-Test or Premium Fuel 93 Octane TourX and Regal 2018 2019

Hi Folks, I've got a whole 550 miles on my Smoked Pearl / Shale 2018 TourX and just put my first gas in the vehicle. I ALWAYS use Top Tier gas and have for years as recommended ( TOP TIER™ Gasoline Brands ) but I am not at all convinced that the TourX requires premiium for general use (not...

buickforums.com

Need Premium Fuel?

Is premium fuel required or recommended for a 2019 TourX? I think mine had regular unleaded (87 octane, 10% ethanol) in it when got it because performance and mileage was better when I first filled it, with premium (91 octane, 10%ethanol). Second tank I just put in is "mid-grade" unleaded 89...

buickforums.com

 

[hoys]

Attach files

A knock sensor can't predict knock, it senses knock when it's occurring. Read this info I found:

The knock sensor detects vibrations that come from a knock or an irregularity in combustion and send a signal to the engine control computer, which then adjusts timing to correct the knock.

Hmmm just like I said, knock has to occur for the system to retard timing.

Correct, but keep in mind knock sensors aren't an on-off switch. They can detect when engine noise gets close to knock and pull timing before a major knock event. It's all about how sensitive your make the system. I have no firsthand knowledge of how this system is implemented in these cars, I'm just making a general statement. With a long powertrain warranty on the line, I'm sure GM would've make 93 required not suggested if it was going to cause catastrophic damage.

 

[BoostedRegal2.0]

Tell that to all the LTG owners here that had to have GM install a new motor because the pistons got destroyed with the stock tune. So obviously GM didn't see that coming. If you hammer the throttle trying to pass someone and it knocks severely there will be catastrophic damage.

 

[landsharkmz3]

GM requires a minimum of 87 (RON+MON)/2, with a maximum ethanol of 15%. The engine is designed, validated, and warranted for these parameters.

For most driving conditions, buy the fuel grade that give you the best BTU/$. In my area, that is almost always 88 E15.

 

[hoys]

Tell that to all the LTG owners here that had to have GM install a new motor because the pistons got destroyed with the stock tune. So obviously GM didn't see that coming. If you hammer the throttle trying to pass someone and it knocks severely there will be catastrophic damage.

One LTG=/= another LTG.

GM historically has different tunes for even different model years of the same everything. Saying a LTG from 2013 is the same as one from 2018+ is pretty naive.

 

[BoostedRegal2.0]

Everyone here doesn't have a 2018, mine is a 2014 and many others here also have the early LTG.

GM requires a minimum of 87 (RON+MON)/2, with a maximum ethanol of 15%. The engine is designed, validated, and warranted for these parameters.

For most driving conditions, buy the fuel grade that give you the best BTU/$. In my area, that is almost always 88 E15.

Nope you can't run E85 in a Regal with the LTG, the car isn't flex fuel compatible. This from my owners manual and I don't have a yellow gas cap:

E85 or FlexFuel Vehicles with a yellow fuel cap can use either unleaded gasoline or fuel containing up to 85% ethanol (E85). All other vehicles should use only the unleaded gasoline as described in Recommended Fuel on page 9-60.

 

[hoys]

Everyone here doesn't have a 2018, mine is a 2014 and many others here also have the early LTG.




Nope you can't run E85 in a Regal with the LTG, the car isn't flex fuel compatible. This from my owners manual and I don't have a yellow gas cap:

E85 or FlexFuel Vehicles with a yellow fuel cap can use either unleaded gasoline or fuel containing up to 85% ethanol (E85). All other vehicles should use only the unleaded gasoline as described in Recommended Fuel on page 9-60.

The user never suggested using E85. Many pump fuels now contain at least 10% ethanol. Or in the poster's case, 15% (E15)

You are also in the 2018+ section of the forums FYI.

 

[BoostedRegal2.0]

10% ethanol is safe to use with the LTG and that's what most people use. The reason the 2018+ LTG's haven't blown up is because most of them are still sitting on dealer lots.

 

[hoys]

10% ethanol is safe to use with the LTG and that's what most people use. The reason the 2018+ LTG's haven't blown up is because most of them are still sitting on dealer lots.

A lack of data points surely can't allow us to know the full picture. The fact still stands that GM says 87 octane fuel is safe for our 18+ LTGs.