Which is better at eliminating LSPI, IVD and turbocharger coking?

Assuming only one could be chosen over the other..

D1G2

Assuming you dont breathe air which would kill you first, snakebite or a nuclear bomb 10miles away.


Most/all D1G2 oil should be api SN+ so you never have to choose.

Chrysler MS-13340 is a similar spec(gdi turbo lspi) for the 2.0t engine
however only Pennzoil Platinum has that spec so its not much help unless you are a PP fan.

API SN+ isnt as stringent as d1g2 or chrysler ms-13340
However API SN+ has a wider viscosity range than D1G2
and D1G2 is a paid spec.. they have to pay GM to put it on the bottle.

so there may be other reasons why an oil is api sn+ but not d1g2, you cant automatically assume its inferior.

This is what I was wondering. Is it possible to even get one without covering the other?

Well, one difference I know off the top of my head is that the max Noack loss for d1G2 is 13% while it is 15% for SN+.
So, an oil could meet SN+ but fail for d1G2 on the basis of that measurement.
It is also my understanding that SN+ doesn't include a turbo deposit test like d1G2 does.
I guess I might be a tad suspicious of an oil that is SN+ and not d1G2 UNLESS it is a grade that is not covered by d1G2...like the 10W30 I am running now.
This is the first non-d1G2 oil I have run since I bought a bottle of M1 5W30 AP because it was the only oil on the WM shelf that had a d1G2 license number! Didn't say Gen 2 on the front because the standard was not "live" yet...Gen 2 is a superset of dexos1 so it met the standard claimed on the bottle by default.

An oil manufacturer may not want to pay the dexos royalties on their SN+ oil... and regardless, dexos is only "required" by GM. You have to make the personal choice of this; with a 5 year old vehicle either SN+ or d1G2 will exceed your engine's oil requirements.

OP, by adding what engine you are talking about, you will likely get better recommendations than just the nebulous question you asked.

Correct me if I am wrong but a 10w30 can be SN+ but not D1G2. Also, lower calcium is a big player with SN+.

Yeah, my M1 10W30 HM I am running now cannot be d1G2 by the definition of the standard...but it is SN+.

I guess I don't really trust Subaru's oil recommendations after they had to recall the FA20DIT engines due to LSPI as well as carbon buildup issues...I only got new plugs and a new ECU program, but some people had engine damage and many others got a free chemical cleaning (no walnut blasting AFAIK). I had already been running M1 5W30 for some time and was glad for it...I'm sure Subaru changed the engines to run a little richer at LSPI danger points as I understand that is supposed to help prevent it, but I'm still going to do whatever I reasonably can to limit the chance of LSPI with my maintenance choices. I don't think Subaru ever updated their oil recommendations for the FA20DIT, unlike GM which was calling out either AC Delco or M1 5W30 specifically after their 1.5l DIT debacle (I would imagine since changed to d1G2).
Like you said, personal choice...I'm sure plenty have people have been putting whatever they want in FA20DITs with no issues.

As evidenced by my present oil, I'm fine with SN+ alone...I just think that I might shy away from a 5W30 that was only SN+ and not d1G2, it would be so easy to get a 5W30 with both.

So I make two semi syn oils that I want to differentiate by price. I pay D1g2 fees on one and slap semi syn on the label ... and charge extra for it.

d1g2

You know that d1g2 encompasses SN+, right?

You might also want to consider dexos2 if you desire a thicker oil. dexos2 is like C3 and is used for all GM cars in Europe, gas/petrol and diesel. In the US, GM only uses dexos2 for the Cruze diesel and C7 Corvette

Typical specification of dexos 1 PCMO available is:

API SN Plus RC (RC = Resource Conserving)
GM dexos 1 Generation 2
GM 6094M
Chrysler: MS-6395
ILSAC GF-5
Ford WSS-M2C947-A (0W20)
Ford WSS-M2C947-B1 (0W20)

https://www.mobil.com/english-us/passenger-vehicle-lube/pds/glxxmobil-super-synthetic

dexos 2 is more focused on Diesel Engines. dexos 1 is a PCMO.

Didn't some experts say in Europe they don't have/use d1g2 or d2 and they have no lspi issues?
I think they use thicker and/or higher hths oil!

On the contrary - GM brands here issued a service bulletin a while back requiring certain gasoline-engined cars to use dexos1g2 to mitigate LSPI. This was slightly inconvenient as most oils here were dexos2, with few d1g2 options available.

Both options have LSPI testing - GM uses the GMOD, and SN+ uses the Sequence IX which is a Ford engine.

Eliminating LSPI is an interesting part of this question. Lubrizol has been out in the market talking about LSPI protection on used oil (both the tests only
look at LSPI protection on new oil).
Lubrizol Podcast on LSPI