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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ


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Old 09-03-2020, 01:48 AM   #15
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As far as I understand, 0w-40 will still have lower viscosity at startup than 5w-30? I wonder why most people do 5w-30 and 0w-40 is rarely mentioned.
Using a viscosity calculator and punching in the specs for Mobil1 5W-30 and 0W-40 shows they cross over around 0 degrees C. Basically, 0W-40 is going to be thicker at any temperature above freezing.
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Old 09-03-2020, 02:40 AM   #16
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Using a viscosity calculator and punching in the specs for Mobil1 5W-30 and 0W-40 shows they cross over around 0 degrees C. Basically, 0W-40 is going to be thicker at any temperature above freezing.
So for cold starts above freezing temperatures 5w-30 is in fact better. Good to know, thanks!
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Old 09-03-2020, 09:54 AM   #17
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Originally Posted by timurrrr View Post
As far as I understand, 0w-40 will still have lower viscosity at startup than 5w-30? I wonder why most people do 5w-30 and 0w-40 is rarely mentioned.
No, typically 5W-30 falls in between the viscosity levels of 0W-20 and 0W-40 for startup and operating temperatures. Oil brands have different viscosity ratings as well, so it really depends. For some brands, like AMSOIL, even 10W-30 has a lower viscosity than 0W-40. But there is also the additional factor of how "cold" the cold start is. With a better viscosity index, the 0W-40 will have a lower viscosity at extremely cold temperatures well below 32F (at least in the case of AMSOIL). It's a very complicated subject honestly, which is why you never stop hearing about it.
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Old 09-03-2020, 10:17 AM   #18
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It's really not all that complicated if you just say, "The number preceding the W only factors in approaching and below freezing."
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Old 09-03-2020, 11:01 AM   #19
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It's really not all that complicated if you just say, "The number preceding the W only factors in approaching and below freezing."
But the thing is, that's not exactly the case at all. For many oils, depending on the second number, a 5W can have SIGNIFICANTLY lower viscosity than a 0W even at or well below freezing temperatures. Unless I am misunderstanding what point you're trying to make with that statement?
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Old 09-03-2020, 01:10 PM   #20
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To make myself more clear, though I was mostly joking, it does make a difference. 0W-20 will have a lower viscosity than a 0W-40 oil at startup. In the case of 0W-16 vs 0W-20, the difference is probably quite insignificant to care about, which is why I intended it to be a joke.
To be sure, viscosity classifications refer to ranges so there are thin 0Ws and thicker 0Ws. Out of curiosity, do you have any empirical data to support this statement?
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Old 09-03-2020, 01:48 PM   #21
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To be sure, viscosity classifications refer to ranges so there are thin 0Ws and thicker 0Ws. Out of curiosity, do you have any empirical data to support this statement?
Just going to stick to the same example as I used earlier with AMSOIL. Though this applies to pretty much all other brands that I have looked into.
https://amsoilcontent.com/ams/lit/da...tins/g2880.pdf

Kinematic viscosity @ 40C is rated at 47.1cSt for 0W-20 and 84.6cSt for 0W-40. Granted this is a fairly toasty temperature to be considered a startup temperature, but there is no magic that occurs in the lower temperatures that changes the viscosity drastically in the other favor. And again, to be clear, by lower temperatures I am referring to near freezing. Somewhere far below that is another topic and not one I am fully knowledgeable on, though I have read some interesting research on it in the past.
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Old 09-12-2020, 04:16 AM   #22
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So to be more specific, itís the ILSAC GF-6 oil that I was referring to in my original post.
https://www.pennzoil.com/en_us/educa...lsac-gf-6.html
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Old 09-12-2020, 09:46 PM   #23
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So to be more specific, itís the ILSAC GF-6 oil that I was referring to in my original post.
https://www.pennzoil.com/en_us/educa...lsac-gf-6.html
Itís still a no from me dawg.
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Old 09-13-2020, 12:22 PM   #24
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Itís still a no from me dawg.
Looks like itís not just 0W-16, they also have a 0W-20 version of it. It looks promising. When I finalize my forced induction, Iím going to give it a try. I suppose it wouldnít hurt to change over to it beforehand.
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Old 09-13-2020, 02:58 PM   #25
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Looks like itís not just 0W-16, they also have a 0W-20 version of it. It looks promising. When I finalize my forced induction, Iím going to give it a try. I suppose it wouldnít hurt to change over to it beforehand.
talk to your tuner about it. many here that are FI step to 5w-30 on the tuners recommendations.
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Old 09-14-2020, 09:25 AM   #26
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I won't even run 0w-20 on my NA motor, but you do you.
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Old 09-14-2020, 12:23 PM   #27
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I won't even run 0w-20 on my NA motor, but you do you.
Curious, what oil are you using and why?
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Old 09-14-2020, 12:39 PM   #28
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Mobil1 0w-40 FS because it offers great protection at higher temperatures, due to maintained oil pressure, and has a higher thermal capacity than 0w-20. It continually tests as one of the best oils on the market.
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