I just got thru with a oil change from a nearby shop and it occurred to me that there was the possibility of the mechanic not using the recommended viscosity.. For my Versa, Nissan generally recommends 0W-20 synthetic oil. Would it matter if it was some other? Thanks!
All 0W-20 oils are equivalent. Oils with different viscosities are not. If the startup viscosity is higher than 0, it means that it takes slightly longer to achieve full lubrication at startup. The second number is the hot engine viscosity.
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That is a loaded question!
0w20 must be synthetic to get the proper weight oil. I don’t believe there are any non-synthetic 0w20s.
To agree with @jtsanders, they are equivalent in that they all do the same job well enough. That said, there are differences in oils called synthetic and it comes down to what base oil is used.
There are better base stocks used but these oils are quite a bit more expensive and most shops won’t carry them. An example is Amsoil or “European formula” oils costing $10 a quart instead of $6 or $7. Enthusiasts, like me, buy and use them.
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And it’s not just viscosity but API certification grade as well. I believe the latest cars 2025 require oil rated SQ. Way back about 1970 they started at SA. So oils have been upgraded about 15 times since then. Better detergents, degradation, wear, etc.
My 2018 Versa owners manual says 5W30 is also OK to use but 0W20 is recommended.
Oooh! Another oil thread! Let’s go for 500 posts here too! 
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Why are you not asking the shop what they use ? Also if it was a quick change like Jiffy Lube there are no mechanics there.
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What does it state on your invoice?
… and some people have reported that JL-type places typically use the same viscosity oil for all vehicles… whether or not that viscosity is appropriate.
0w20 is one of the most common viscosities . . . and has been for several years
If the shop doesn’t have it and used something else, they’re an outdated joke and need to close their doors for good, imo
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Much more way back… API SA rating started in the 1930s.
I bought a quart of SA rated oil as a joke in 1993… Rockytop Motor Oil. Smelled and looked like thin gear oil.
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Dollar General was found to be selling both SA & SF oil in… I think… 2016. The NJ AG was able to get a judgment against them, resulting in the payment of a fine.
JL actually does repairs now and has for several years, at least in my area. I never used them and don’t have any idea of whether they do good work or not. I did see a wall full of ASE certifications at the JL near me that I used for oil changes (they did that well). The last I saw their cost for a synthetic oil change was far more expensive than anywhere else near me and that’s why I stopped going there.
You are mostly correct sir, but Pennzoil makes a Gold 0W-20 Synthetic Blend Motor Oil…
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Interesting. I thought you couldn’t get the 0 part if it wasn’t full syn. But I’d also not say that “belief” was based on any true expertise.
Yep, it is more common in shops then at auto parts stores, but you can buy it, just have to look around for it… But yeah, any repair shop or oil change place that carries Pennzoil can get it in the blend…
Here’s a list of the API Service Classifications over the years: