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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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09-03-2020, 12:48 AM | #15 |
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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.
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09-03-2020, 01:40 AM | #16 |
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So for cold starts above freezing temperatures 5w-30 is in fact better. Good to know, thanks!
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09-03-2020, 08:54 AM | #17 |
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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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09-03-2020, 09:17 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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09-03-2020, 10:01 AM | #19 |
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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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09-03-2020, 12:10 PM | #20 | |
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09-03-2020, 12:48 PM | #21 | |
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Quote:
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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09-12-2020, 03:16 AM | #22 |
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So to be more specific, it’s 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 |
09-12-2020, 08:46 PM | #23 | |
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09-13-2020, 11:22 AM | #24 |
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09-13-2020, 01:58 PM | #25 |
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talk to your tuner about it. many here that are FI step to 5w-30 on the tuners recommendations.
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09-14-2020, 08:25 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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09-14-2020, 11:23 AM | #27 |
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09-14-2020, 11:39 AM | #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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