[KuroOkami]

I was wondering if anyone knew why the reason behind the change in recommended fluids for the LT1 equipped Camaros. I thought the engines were supposed to be complete identical, but the more I keep reading and preparing for my new car, I keep finding these differences.


I was also reading today on these forums that the sound tubes to the firewall seem to be gone from recent production V8 Camaros.


Were there minor changes that they aren't telling us about? Any ideas?

[radz28]

Probably due to oil consumption/DI stuff. I don't know that it's fair to say "issues" but that might be the simple way to say it.

The new stuff is Dexos 2. I believe the weights are thinner, so it also has to do with efficiency and less drag through the engine.

https://mobiloil.com/~/media/amer/us...ne%20pager.pdf

[DorkMissile]

The fluids that GM recommends is constantly changing due to the what the EPA tells them

[arpad_m]

Also, the Mobil1 0W40 oil wasn't available in 2015 when they launched the car. It seems to be a better oil, why not upgrade the recommendation once it's released.

[2SS Capt]

Originally Posted by arpad_m

Also, the Mobil1 0W40 oil wasn't available in 2015 when they launched the car. It seems to be a better oil, why not upgrade the recommendation once it's released.

This!

Follow the latest guidance!

[6spdhyperblue]

The fuel went low sulphur in 2017

[DorkMissile]

Just understand - environmental demands is what drives the research in motor oils.

One way to think about it, that with each new "generation" of oils that comes along, (API SJ to SL, SL to SM, etc....) you end up with a product that is as almost as good as the previous generation as far as lubrication goes, but contains less "dirty" ingredients (things like Zinc and Sulfur). The best oils you can buy over the counter are actually the older ones that are SJ level.


It is just that if you run SJ oils in a stock modern car, you could see issues with clogging the cats as the older ingredients tend to want to stick to the cats when hot.

A newer oil or newer API certification doesn't mean it is better at lubricating

[KILLA BEE]

Originally Posted by DorkMissile

Just understand - environmental demands is what drives the research in motor oils.

One way to think about it, that with each new "generation" of oils that comes along, (API SJ to SL, SL to SM, etc....) you end up with a product that is as almost as good as the previous generation as far as lubrication goes, but contains less "dirty" ingredients (things like Zinc and Sulfur). The best oils you can buy over the counter are actually the older ones that are SJ level.


It is just that if you run SJ oils in a stock modern car, you could see issues with clogging the cats as the older ingredients tend to want to stick to the cats when hot.

A newer oil or newer API certification doesn't mean it is better at lubricating

Jus had an oil change yesterday. They recommend Mobile 1 now period. No more Dextrose

[abbadon3718]

Originally Posted by KILLA BEE

Jus had an oil change yesterday. They recommend Mobile 1 now period. No more Dextrose

?
Dexose and dexose 2 are standards, not brands. I just bought some mobile 1 that was dexose 2. The factory oil was AC Delco brand dexose I believe, is that what you meant?

[2SS Capt]

Originally Posted by abbadon3718

?
Dexose and dexose 2 are standards, not brands. I just bought some mobile 1 that was dexose 2. The factory oil was AC Delco brand dexose I believe, is that what you meant?

The factory fill is Mobil 1 0W-40 ESP Formula (it is Dexos 2 certified (blue Dexos logo))

[Dixie ZL1]

Emissions & CAT protection

[arpad_m]

Originally Posted by DorkMissile

Just understand - environmental demands is what drives the research in motor oils.

One way to think about it, that with each new "generation" of oils that comes along, (API SJ to SL, SL to SM, etc....) you end up with a product that is as almost as good as the previous generation as far as lubrication goes, but contains less "dirty" ingredients (things like Zinc and Sulfur). The best oils you can buy over the counter are actually the older ones that are SJ level.


It is just that if you run SJ oils in a stock modern car, you could see issues with clogging the cats as the older ingredients tend to want to stick to the cats when hot.

A newer oil or newer API certification doesn't mean it is better at lubricating

I understand, but we are pretty much stuck between a rock and a hard place. Replacing clogged cats is expensive, deleting them is illegal and the car won't pass emissions, running the new oil is still the best we can do.

(Also, one of the advertised features of the new 0W40 is that one can run the same oil on the street and for light track duty, so I'm not 100% sure changes are solely related to emissions, but my knowledge of motor oils is very limited.)

[Dixie ZL1]

Originally Posted by arpad_m

I understand, but we are pretty much stuck between a rock and a hard place. Replacing clogged cats is expensive, deleting them is illegal and the car won't pass emissions, running the new oil is still the best we can do.

(Also, one of the advertised features of the new 0W40 is that one can run the same oil on the street and for light track duty, so I'm not 100% sure changes are solely related to emissions, but my knowledge of motor oils is very limited.)

15W50 Mobil 1 is still recommend for track duty. I would not (and don’t) run 0W40 for track duty. I always change oil before and after track days. Mobile 1 ESP oils were specifically developed for emissions system protection.

15W50 is not available in Dexos2 BTW.

[arpad_m]

Originally Posted by Dixie ZL1

15W50 Mobil 1 is still recommend for track duty. I would not (and don’t) run 0W40 for track duty. I always change oil before and after track days. Mobile 1 ESP oils were specifically developed for emissions system protection.

15W50 is not available in Dexos2 BTW.

Sure, I'm just saying Mobil advertises this capability, see below (they mention the C7 with both the LT1 and the LT4 later). High temperature viscosity of this oil must be better if they are willing to claim "track to street", even if the focus was clearly on emissions.

https://mobiloil.com/~/media/amer/us...ne%20pager.pdf