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PQIA Analysis of 5w30 in 2021, when it was updated to be rated API SP and ILSAC GF-6A: https://pqia.org/kirkland-full-sy...motor-oil/
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Hmmm... now I have to decide if the Slickdealer in me is willing to wait and book up my 30th like that.
Also, you may encounter archived information as D1G2 has been superseded by D1G3, it still retains the SP rating, but it is blue instead of green.
That said, it's unsure how this relates to the ILSAC rating, as I can't find it anywhere on the ELOCS.
To be safe, you may just want to stick with the ACEA rating.
TL;DR stick to the manual.
So, for my turbo Subie, for which I have actually experienced something I attributed to LSPI way back when, I choose to use an oil that's designed to mitigate LSPI, eg, D1G3. If a gen 4 or API equivalent is released that is supposedly for turbo engines and LSPI mitigation I'll move to that.
Edit: I don't get the downvotes. It's a fact that API spec's and even manufacturer's spec'd can be superseded. API SL, SN, SN+, etc. GM Dexos 1 gen 1, 2 and now Dexos 1 Gen 3.
Outside of that people have always found a reason to try different oils that may be more robust and provide better protection. A good example is running a 5W-40 heavy duty engine oil in a high-power vehicle only spec'd for API SM. My 2008 STI is an example. I chose to use Shell Rotella T6 5W-40 in place of any Resource Conserving SM-rated 5W-30. This is pretty standard and doesn't hurt a thing. For more sophisticated DIT engines, it's more complicated.
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0w-16 supertech needs to be available in my area!
Contrary to some of the posts here, many of us were able to find clearance synthetic for dirt cheap over the past ten years. I still have a couple of jugs of Pennzoil 5W-20 synthetic that's from when API SN first came out for around $10/5 qt jug, maybe a little less. It'll eventually go in my low-powered Subie (2.5i), which isn't picky about having the latest spec oil.
Others on bobistheoilguy have been way luckier than me over near past with funding name-brand synthetics for even cheaper. It's a huge YMMV. My best find was German Castrol 0W-30 for a couple of bucks a quart or less, IIRC. I believe I purchased 24 qts or more for my WRX STi back then.
It's been harder to find clearance oul around me these days, so my stockpile is just those several jugs I mentioned earlier.
I also don't mind having extra in case a friend or family member is tight for cash or time and I can offer a free oil change, but, as you mention, it's pretty easy to go pickup a jug and a filter for that rare case when you need to spend full price.
The only way to know for sure is to send off a sample for analysis. Maybe you are shearing that oil down or diluting it with fuel to a detrimental degree and a shorter interval is prudent. If you don't have any engine issues, then that's probably not likely and you'll find that 5k miles intervals is NOT too long.
Also, you may encounter archived information as D1G2 has been superseded by D1G3, it still retains the SP rating, but it is blue instead of green.
That said, it's unsure how this relates to the ILSAC rating, as I can't find it anywhere on the ELOCS.
To be safe, you may just want to stick with the ACEA rating.
TL;DR stick to the manual.
Is it the venerable 4.0? You can probably dump the cheapest oil of the correct spec, as needed, and never have to worry about an oil-related failure. Also, every time you add a quart you're replenishing the additives.
I personally just changed the oil in my turbo Subie (FA20DIT) with Kirkland Signature 5W-30 Dexos 1 (ONE) Gen 3, which IS tested to mitigate LSPI.
When I researched this several years ago, the Dexos 2 (not gen 2) was spec'd by GM for their small turbos, but then they changed it to Dexos 1 due to LSPI. I would personally stick with D1G3 if you have a small turbo engine with direct injection. If you don't have direct injection, then D2G2 will likely be more robust.
Where did you see they were dexos2? That's a diesel spec fluid which I don't believe either of these are. The little green icon looks like a 2 but it is just a logo and you'll see a small 1 inside. I believe they are both dexos1 Gen 2 (which also protects against LSPI).
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