Costco/Kirkland Full Synthetic Oil on Sale $3.20/quart, delivered

[sajohnson]

https://www.costco.com/kirkland-signature-5w-30-full-synthetic-motor-oil-5-quart,-4-pack.product.100690432.html

All weights:
https://www.costco.com/motor-oil.html?refine=||Brand_attr-Kirkland+Signature

See the sticky thread for more info about Kirkland and others.

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[jsus]

Also available in select weights for in-store purchase at 2x 5qt (10qt total) for $29.99 ($3/qt). Options near me include 0w-20, 5w-20, and 5w-30. Online doubles up for 4x 5qt for $63.99 ($4 extra for shipping).

Ends May 5.

 

[sajohnson]

More info about Costco/Kirkland oil:
https://pqia.org/kirkland-full-synthetic-sae-5w-30-motor-oil/

As most people know, their oil is made by Warren. Here's a list of all of the other brands of oil Warren makes:
https://engineoil.api.org/Directory/EolcsResultsDetail?accountId=-1&companyId=10297

FWIW, the Kirkland jugs say "dexos approved Gen 2". Ford makes no mention of 'dexos' in the manual (probably because it's a GM standard) but it sounds like a good thing:

"Dexos Gen 2 is a new generation of engine oil developed by General Motors (GM) that offers more advanced protection than the first generation. It was introduced in 2015 and is designed to protect engines from low speed pre-ignition (LSPI), which can damage smaller turbocharged engines. Dexos Gen 2 also offers improved oxidation and deposit control."
https://www.cenex.com/about/cenex-information/cenexperts-blog-page/oil-and-lubricants/dexos1-gen2-what-you-need-to-know

There is also a dexos Gen 3 (see link above) which is apparently even better:

"As engine technology moves toward even stricter EPA requirements, GM released the Gen 3 rules for dexos 1 to further manage oil properties in a global system. Gen 3 dexos oils (commonly referred to as “dexos 1 Gen 3”) have been adjusted to include turbocharger cleanliness, turbo coolant control, and oxidation. For example, Gen 2 limits for deposit formation are 100 max/5.2 min, while Gen 3 reduces those limits to 75 max/5.3 min., and turbo deposits went from 13% maximum increase in deposits to 11% maximum deposit increase. Even the fuel economy increases with the dexos 1 Gen 3 formulation. dexos 1 is for gasoline engines only, this is not designed for diesels. It is backwards compatible with older GM engines. dexos 1 is available in 0W-20 and 5W-30 grades."
https://www.speedwaymotors.com/the-toolbox/dexos-1-vs-dexos-2-what-is-gm-dexos-oil/120130

 

[sajohnson]

More on dexos 1. Here's a good chart that also includes API classifications:

Easier to read here -- bottom of page:
https://www.speedwaymotors.com/the-toolbox/dexos-1-vs-dexos-2-what-is-gm-dexos-oil/120130

GOOD NEWS: Kirkland is included in GM's list of approved dexos 1 Gen 3 oils:
https://www.gmdexos.com/brands/dexos1_3/index.html

 

[Mark S.]

Dexos is essentially GM's implementation of API ILSAC GF-6A/B and SP spec.

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