Just saw this today. Amazon f-ed up my order on Renewable Lubricants so had to scramble.

Checked out the other oils as good as RLI according to the 540 ratblog and noticed Quakerstate Ultimate ranked higher in durability. I looked up Walmart and they were selling these at $18 for 5qts. Almost half of what I get RLI for. So I’m picking this up and trying it out.

here is the Walmart link:
https://www.walmart.com/ip/Quaker-St...uart/177257743

here is the link to the 540 rat log showing the oil rankings:
https://540ratblog.wordpress.com/201...-test-ranking/

 

Here is the blurb on 540 on QSUD. It was only behind Amsoil, Tribodyn, and Pennzoil Ultra with additives:

5. 5W30 Quaker State Ultimate Durability, dexos 1 – Gen 2, API SN “Plus”, synthetic (green bottle) = 133,125 psi
This oil was tested again in late 2019 for two reasons:
1. It became available with the API SN “Plus” certification, so there was an interest in seeing if there were any changes in its performance.
2. This oil was purchased at Walmart. And that was significant because it was so shockingly cheap at Walmart, compared to mainstream Auto Parts Stores, that there were concerns that Walmart might be selling counterfeit oil. Here’s why:
This oil was purchased at Walmart in late 2019, where the price was about $6.00 per quart bottle, and about $20.00 per 5 quart jug. At the same time, a few miles away, this oil’s price at Pep Boys Auto Parts Store was about $9.00 per quart, and about $35.00 per 5 quart jug. So, there was a need to find out if this oil being sold so cheap at Walmart was legitimate or not. Sure, you could say that Walmart makes such large purchases that it gets a break on price. But then, you could say the same thing about Pep Boys Auto Parts chain stores. But, the proof was in the pudding as they say. And as you can see by the psi value and ranking position above, this is the best performing 5W30 Quaker State Ultimate Durability, that I’ve ever tested. So, Walmart gets a clean bill of health. They are selling legitimate QSUD, and there is nothing to be concerned about. Now, we would have a hard time justifying buying this oil anywhere besides Walmart.
zinc = TBD
phos = TBD
moly = TBD
The psi value of this oil, which came from testing it at the normal operating test temperature of 230*F, put it in the FANTASTIC Wear Protection Category.
However, I went on to also test this oil at the much higher temperature of 275*F. At that elevated temperature, any hotter and thinner oil is expected to experience a drop in Wear Protection Capability. And this oil did have a 13% drop in capability. However, even at that reduced value down to 115,764 psi, this much hotter and thinner oil was in the INCREDIBLE Wear Protection Category.
I also tested this oil to find out its onset of thermal breakdown, which was 275*F.

 

This is what I'm running and my car seems to really like it. I can't even tell my car is running and it doesn't burn any oil, so for the price and the quality you can't go wrong.

 

So you did experience the engine chatter quiet down? That was my experience when I went from M1EP to Renewable Lubricants. What oil did you use before Quaker State UD?

 

I changed the oil as soon as I purchased it so I can't give you a before/after comparison. The engine is mostly silent once warmed up and I noticed at a stoplight how quietly it idles.