Here's a search for 12 packs of oil jugs [costco.com] if you'd rather get them.
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expired Posted by HappyPixel • Apr 9, 2025
Apr 9, 2025 10:45 AM
Item 1 of 2
Item 1 of 2
expired Posted by HappyPixel • Apr 9, 2025
Apr 9, 2025 10:45 AM
Costco Members: 4-Pk 5-Qt Kirkland Signature Full Synthetic Motor Oil (various)
+ Free Shipping$54 each
$70
Costco Wholesale
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The stuff sold at a price point (bargain basement) will meet API SP and dexos1 will have a treat rate of about 8.5% wt in the engine oil. Treat rate is the focus for products sold under a bid as the additive is sold by the ton, the less you use the cheaper the product. The more premium stuff will meet ACEA, MB 229, VW 501, etc. and have a treat rate of closer to 13%.
Now the clincher for me is that cheap additive package will pair with a cheap viscosity modifier (VM), the stuff that makes it a 0W-xx, usually some olefin copolymer (OCP). These are what I refer to as dirty polymers because they tend to leave more deposits as they break down (piston walls, skirts, rings, turbo bearings).
Those premium packages because they need to pass more stringent Euro specs will use a styrenic type polymer usually a star polymer which is a cleaner and more shear stable VM. This helps us keep the pistons cleaner = less scuffing, blow by, better power, better fuel economy, and these days more importantly a cleaner turbo as those are very hard on oil.
In the end the cheap stuff will not kill your engine, but much like living on ramen noodles and McDonalds it isn't going to make that engine stay at like new performance. I used to formulate this stuff before I retired so happy to answer questions.
Lower viscosity in the US is for CAFE reasons, not motor longevity.
page 8 and 9
https://engineoil.api.o
Warren Oil
https://www.warrenoil.c
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also, I bought this Kirkland oil about 4 years ago and the rest is sitting in storage. do you know if oil expires? if so how badly
Regardless in for more. Not even a member anymore but $3.50 non member charge still worth it.
If your vehicle takes 5 quarts it's not an issue…..unless you're just trying to add a quart between oil changes.
Happened with my sons car. It was down 2 quarts. Grab the gallon and start pouring. Think I've put somewhere between one and two quarts and go to the strip to check how much I've put in and can't tell anything at all.
Just know if you're buying there's a definite chance that the white strip gauge doesn't work.
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also, I bought this Kirkland oil about 4 years ago and the rest is sitting in storage. do you know if oil expires? if so how badly
The taste will start to get a little rancid perhaps. But it would still be fine for cooking or in sauces
I had used one back then and still couldn't tell.
Tested with bottle again…inside with flashlight pointing down the pour spout and I could make out the level. Outside in sunlight I could not. Kind of a pain if your outside putting in a quart or two.
Was in warehouse since I posted and checked the bottles. Was very easy to see the level.
So, it's likely the ones I received were part of a bad plastic molding problem.
I had used one back then and still couldn't tell.
Tested with bottle again…inside with flashlight pointing down the pour spout and I could make out the level. Outside in sunlight I could not. Kind of a pain if your outside putting in a quart or two.
Was in warehouse since I posted and checked the bottles. Was very easy to see the level.
So, it's likely the ones I received were part of a bad plastic molding problem.
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