Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Running different oil weights for summer season (AutoX/Track)

ZDan · 05-21-2023, 11:43 AM

If you're tracking the car, IMO good high-HTHS (high-temp/high-shear) 5w30 is a must. I ran Redline 5w30 in the '17 and will run that in the new '23 for track season as well. They advertise HTHS of 3.7 mPa-s, where 5w30 is 3.0 minimum, and 0w20 can be as low as 2.6 (I think these #s are correct but going off top of head here...)

You don't have to "verify" anything with oil pressure readings, 0w20 have a known specified viscosity and HTHS range, any 5w30 will definitely have greater viscosity and greater film strength at higher operational temps.

05-21-2023, 11:43 AM	#7
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,672 Thanks: 1,439 Thanked 4,011 Times in 2,097 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	If you're tracking the car, IMO good high-HTHS (high-temp/high-shear) 5w30 is a must. I ran Redline 5w30 in the '17 and will run that in the new '23 for track season as well. They advertise HTHS of 3.7 mPa-s, where 5w30 is 3.0 minimum, and 0w20 can be as low as 2.6 (I think these #s are correct but going off top of head here...) You don't have to "verify" anything with oil pressure readings, 0w20 have a known specified viscosity and HTHS range, any 5w30 will definitely have greater viscosity and greater film strength at higher operational temps.