Trying to determine the viscosity of two different oils at a specific temperature...help

[TiGeo]

0W-20 (Toyota GR Corolla) and 5W-40 (HPL) at 280 deg F. I believe @OVERKILL knows how to calculate this?

 

[mitsuman47]

Not sure how accurate this is, but it has been passed around for quite some time. Punch in your 40 and 100c viscosities and it’ll graph them for you.

https://www.widman.biz/English/Calculators/Graph.html

 

[TiGeo]

Not sure how accurate this is, but it has been passed around for quite some time. Punch in your 40 and 100c viscosities and it’ll graph them for you.

https://www.widman.biz/English/Calculators/Graph.html

Thank you v. much. This is exactly what I was looking for/thinking of.

 

[OVERKILL]

Thank you v. much. This is exactly what I was looking for/thinking of.

Yeah, that's the tool I use, lol.

 

[TiGeo]

Yeah, that's the tool I use, lol.

So here are my findings. At 280 deg F the 40 grade is a 20 grade and the 20 grade is an 8 grade. Keeping temps around 230 deg F max for the 20 grade would basically give equivalent viscosity to the 40 at 280 deg F. I hopefully got that correct.

 

[Rand]

I did something similar with m1 esp. Awhile back.
m1 0w30 ESP@120C is the same viscosity as m1 0w20 afe@100C
or for metrically challenged 248F and 212F

Thread 'The importance of oil Temperature in Determining what Viscosity of oil to run.'

Dec 17, 2024

I wanted a viscosity buffer for fuel dilution in my FA24DIT engine. (260hp turbo)
Note: all temps in Celsius convert if you need F
I was expecting oil temps higher than my FB25(182hp naturally aspirated) powered Subarus which ran between 105C and 115C in normal driving.
So I picked M1 0w30 ESP which is a 12.2cst oil@100c

I found out as I drove my fa24dit powered outback that the oil temps rarely reach 100c and really live between 88C-95C
Even in the summer in conditions that would push my FB25 oil temp near 115C (towing w/ac etc) I never went higher than 98C

If you look...

• Rand
• Replies: 66
• Forum: Passenger Car Motor Oil (PCMO) - Gasoline Vehicles

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[facility1]

if you are a Mobil 1 fan boy,look at the 0w-30 AFE,as its a reasonably good oil. Though Pennzoil ultra Platinum is a very fine oil too worth considering first..

 

[TiGeo]

if you are a Mobil 1 fan boy,look at the 0w-30 AFE,as its a reasonably good oil. Though Pennzoil ultra Platinum is a very fine oil too worth considering first..

Not for me...I'm good on what I use. This was in regards to a GR Corolla that blew the motor on track running 0W-20.