Cleaner 5W-30 for GDI engines?

[AZjeff]

I recently bought a '16 Silverado with the 4.3 Ecotec3, it had direct injection and the dreaded AFM cylinder deactivation. The problems with both of these features come from deposits from the oil, in some cases from neglected OCIs. The truck calls for 5w30, are there any oil brands known for running cleaner? Conventional or synthetic? Really like the truck so far and would like to do whatever I can to help prevent problems later. DEXOS rated too. Thanks

 

[skyactiv]

GM has put thought into LSPI for the latest DEXOS1 oil spec. It's a balancing act dealing with an oils cleaning ability and trying to prevent LSPI.

This synthetic blend tested stupid good a few years ago. http://www.pqiamerica.com/June 2014/ACdelco.htm

http://noln.net/2016/06/30/changing-specs-latest-ck-4-fa-4-gf-6-and-dexos1/

 

[merconvvv]

I am wondering the same for my sisters chevy.

Quaker State Ultimate Durability 5w30 has low noack according to pqia tests on 5w30.
It is about 8.6

And in az after warranty runs out could you use 10w30?

 

[jongies3]

The Pennzoil synthetics and even Gold blend are all Dexos rated and excellent at maintaining factory cleanliness.

 

[zeng]

How AC Delco 5W30 achieves such low Noack of 7.9%?
It's base oil must be rare and high cost ?

 

[merconvvv]

Zeng
Thanks for pointing out ac delco 5w30
That is pretty good noack number.
Is it made by exxon mobil.?

 

[ChrisD46]

If your engine and temps allow - Mobil 1 10W30 is one of the better oils for a GDI engine : Low NOACK , lower calcium (prevents LSPI) and least VII's (new culprit in intake valve deposits) in GDI engines. I am using this until new GF6 and DEXOS 1: 2015 syn oils come out .

 

[AZjeff]

Thanks for the heads-up on the Mobil 1 10w30. LSPI isn't a concern and I'll probably stay with DEXOS oil through the warranty period but 10w30 is worth considering.

 

[merconvvv]

What is the noack of Mobil 1 10w30?
Been trying to find out for the longest time.

 

[ChrisD46]

I believe LSPI can be an issue with turbo GDI engines but can not find anything much regarding non - GDI engines ? I'm fine with SOPUS synthetics in my non - GDI engines but that extremely high calcium in SOPUS oils is a little disconcerting in a GDI engine as compared to Mobil 1 synthetic 5w30 and 10w30 oils which is lower in calcium yet still gets decent cleaning reviews . The GDI engine is the one engine that just really points to Mobil 1 10W30 as being a darn good option to delay / postpone the intake valve deposit walnut blasting that often can rear it's head at 30K miles . * A lot of folks say GM and Japanese GDI engines have done a pretty good figuring out the GDI preventive intake valve deposit thing but Fords , VW's and possibly Hyundai / Kia are secretly expressed shiped to Area 51 for intake vale cleaning after 30K miles (lol ) ! Not to get off topic but my theory to deal with intake valve deposits in a GDI engine : 1) Use only Top Tier gas 2) Use Mobil 1 10W30 if temps and manual permit for it's low NOACK and least VII's 3) limit OCI's to 5K miles 4) Do not lug the engine - keep RPM's at 2K or above if possible (I use "sport mode" electronic AT option).
Originally Posted By: AZjeff
Thanks for the heads-up on the Mobil 1 10w30. LSPI isn't a concern and I'll probably stay with DEXOS oil through the warranty period but 10w30 is worth considering.

 

[ChrisD46]

Through extensive on - line research , the aid of a weegee board and devining rods "I put the Mobil 1 10W30 NOACK squarely between 6.0 ~ 6.9". Quaker State Ultimate Durability 10W30 shows new specs for NOACK at 5.6 (most likly with GTL base stocks) however Mobil 1's base stocks are pretty good themselves thus why I believe the Mobil 1 10W30 NOACK of 6.0 ~ 6.9 is a pretty accurate estimate.
Originally Posted By: merconvvv
What is the noack of Mobil 1 10w30?
Been trying to find out for the longest time.

 

[merconvvv]

I thought Quaker State Ultimate Durability 10w30 noack was 5.0
Where did you see 5.6?
Mobil just needs to specify noack so we all quit speculating.
God knows i have spent a lot of time too trying to figure it out.
Mobil provides it for theoretical blends but not for off the shelf products.

 

[ChrisD46]

My mistake saying Quaker State Ultimate Durability was 5.6 I believe the spec is out there showing 5.0 (awesome ) .

 

[merconvvv]

Around 2005 Mobil 1 Extended Performance 10w30 tested at 7.5 by amsoil study.
Dont know if formulation has changed much.