GM now saying to use 0w40 in 21-24 6.2L

[02SE]

Any word on whether this applies to the LT5? It's not listed, but it's also out of the standard warranty.

 

[redhat]

This is just mind blowing. GM admitting this. Dexos R getting full-saps Euro FS and X4 approvals in the blink of an eye.

Wow now we’re gonna be trying to decide what’s best between FS, ESP and Supercar.

 

[burbguy82]

This is just mind blowing. GM admitting this. Dexos R getting full-saps Euro FS and X4 approvals in the blink of an eye.

Wow now we’re gonna be trying to decide what’s best between FS, ESP and Supercar.

Every lie see truth at some point, there is no getting around it. I am surprised aswell, especially in modern times. I dont think that FS is Dexos R though.

Edit: I see that FS is all of a sudden on that list. I find that to be fishy.

 

[JavierH19]

My friend has a Cadillac Escalade. His died on the highway last week. He was going 75 mph and it just cut off. All the dash lights came on. No sputtering no catastrophic sounds. It just shut off, and wouldn’t restart with the button. It needs a whole new engine, 2 1/2 month wait. 20K miles on it.

10 week wait? Gm can't have that low of a supply of l87's. People should be given the option to accept a 5.3 and get some money back. I'd take it, better mpg and I get a check. Not gonna tow with it.

 

[JavierH19]

Yeah that's fishy, M1 FS suddenly popped up on the dex r list and it's not on 0w-40 Fs's page. The three license that end with 17 weren't there last year in October so those 3 got added in recently. It was only the two with 15 that were there before.

 

[thescreensavers]

Here’s a before an after almost overnight. Bright side there will be more brands eventually making it lowering the price. Super car isn’t the cheapest for the average joe at Walmart.

View attachment 275415

View attachment 275416

Wow M1 0W40 FS is DexosR approved. So many people on the Camaro groups would shun you if you didn't use supercar

 

[burbguy82]

Wow M1 0W40 FS is DexosR approved. So many people on the Camaro groups would shun you if you didn't use supercar

In my mind, they would be right, unless the FS formulation has changed......or maybe vice versa

 

[userfriendly]

10 week wait? Gm can't have that low of a supply of l87's. People should be given the option to accept a 5.3 and get some money back. I'd take it, better mpg and I get a check. Not gonna tow with it.

Better still, drop a 632 crate motor in it.
The 6.6L truck engine is available in crate along with a high performance version.
No cylinder deactivation or fake engine sounds from the stereo system required.

 

[thescreensavers]

I

In my mind, they would be right, unless the FS formulation has changed......or maybe vice versa

The formula has changed recently but "FS" is still full saps. DexosR or Dexos2 historically was low saps

 

[4WD]

From the other thread on the topic:

Please note: GM dexos R engine oils meet or exceed the performance of GM dexos 2 and GM dexos 1 Gen 2 and Gen 3 oils and are backward compatible, therefore vehicles equipped with gasoline engines that used GM dexos 2, or GM dexos 1 Gen 2 or Gen 3 may use a GM dexos R licensed engine oil of the appropriate viscosity grade at their next oil change.

Licensed dexos®R brands​

Mobil 1 Supercar	ExxonMobil Oil Corporation	dexos™R	0W-40	DR40FADA015
Mobil 1 Supercar	ExxonMobil Oil Corporation	dexos™R	5W-50	DR40JADH015
Mobil 1 FS	ExxonMobil Oil Corporation	dexos™R	0W-40	DR40FAGD817
MOBIL 1 ESP X4 0W40	ExxonMobil Oil Corporation	dexos™R	0W-40	DR40FBGD817
Mobil 1	ExxonMobil Oil Corporation	dexos™R	0W-40	DR40FCGD817

[th width="276px"]Brand Name[/th][th width="230px"]Supplier[/th][th width="138px"]Specification[/th][th width="66.9766px"]Viscosity[/th][th width="184.023px"]License Number[/th]

ExxonMobil Oil Corporation?
GM can’t get that right either.

 

[Glenda W.]

But you can’t use a heavier grade because vvt won’t work right, clearances are to tight and oil passages are to small….

 

[BornSlippy]

But you can’t use a heavier grade because vvt won’t work right, clearances are to tight and oil passages are to small….

Oil pump isn't calibrated for xW-40 either.

 

[rijndael]

10 week wait? Gm can't have that low of a supply of l87's.

https://gmauthority.com/blog/2025/02/gm-cant-keep-up-with-6-2l-v8-engine-replacements/

 

[That John dude]

I don't run 93 in my 6.2. I run 87 and when driving it normally it pretty much never knocks. I can only remember one single time I drove it where I heard knock but it was just one knock not multiple like when you're flooring it with old gas. The l86 6.2 has the same compression as the l87 but does say to use 87. I think running fresh gas helps. I usually get gas at Costco cause it's the closest so not only good quality but gets refilled constantly.

L86 “recommends” premium I have a 2014 L86. The L87 also “recommends” premium.

 

[TiGeo]

My son is a GMC tech and told me about this yesterday. Wow. Thickie power level 11 unlocked/infinity win thick/thin argument

 

[That John dude]

Not an official GM link, but here’s tfl truck link

https://tfltruck.com/2025/04/gm-recalls-6-2-v8-chevy-silverado-gmc-sierra-for-engine-failures/

 

[4WD]

Not an official GM link, but here’s tfl truck link

https://tfltruck.com/2025/04/gm-recalls-6-2-v8-chevy-silverado-gmc-sierra-for-engine-failures/

Some clown thinks he deserves $5million. That would buy allot of engines for others just as important as he is …

 

[That John dude]

Some clown thinks he deserves $5million. That would buy allot of engines for others just as important as he is …

People want something for nothing. I understand it’s frustrating to have major mechanical failure, but 5 mil is nuts.

 

[Nuclear_42]

So glad I switched to Amsoil SS 0w-40 recently at the 9k mile mark on my 24 L84. If it’s good enough for an LT4. Then good enough for the rest.

 

[SubieRubyRoo]

My ford ecosport started having loud ping at throttle tip in this spring.
12.5:1 compression small n.a. engine in a 3500lb gross weight AWD Mini SUV running 87 octane.
ECU corrected that in 2 seconds. Maybe just engine control, not top ringland ash related. Lot of late fuel burn down around the top ring.
Better than early burn, I suppose. Ford OM state to use premium fuel if "a knocking sound from the engine is heard" Lol. It was a Ford Mazda 2 D.I. 2 liter.

Why does everything you say have to be exaggerated? Ford never put a 12.5:1 engine in ANY EcoSport. The 1.0L EcoBoost Fox was 12:1, and it was the only engine above 10.1 out of any engine available, anywhere, ever, in an EcoSport.

The highest compression ratio offered in a gasoline Ford EcoSport is **12.0:1**, found in the **1.0L EcoBoost Fox engine** (naturally aspirated version) used in some EcoSport models. This engine is a decontented variant of the 1.0L EcoBoost, designed for affordability, and features a higher compression ratio due to its naturally aspirated design and port injection.[](https://en.wikipedia.org/wiki/Ford_EcoBoost_engine)

Other gasoline engines in the EcoSport, such as the 1.0L EcoBoost (turbocharged) and 1.5L Ti-VCT, typically have lower compression ratios, ranging from **9.7:1 to 10.1:1**, depending on the model and market. Always check specific model details, as compression ratios can vary by region and year.[](https://en.wikipedia.org/wiki/Ford_EcoBoost_engine)[](https://www.cardekho.com/ford/ford-ecosport-2015-2021-specifications.htm)

Also, the heaviest empty curb weight EcoSport never even weighed 3400lbs.

The heaviest Ford EcoSport curb weight is **3,360 lbs** (1,524 kg) for the **2022 Ford EcoSport Titanium trim** with all-wheel drive and the 2.0L Ti-VCT engine.[](https://www.autopadre.com/vehicle-weight/ford-ecosport)

Curb weights vary by model year, trim, and drivetrain. For comparison, lighter trims like the 2021 EcoSport S with front-wheel drive weigh as low as **3,020 lbs** (1,370 kg). Always verify with specific model details, as weights differ across markets and configurations.[](https://www.autopadre.com/vehicle-weight/ford-ecosport)

But again, Arco, thank you for the daily laughs with your tall tales. Have a great weekend!