10w40 vs 20w50 for track use
#1
10w40 vs 20w50 for track use
I have done a few track days and I'm hooked . My car has basic engine mods (exhaust, intake, tune) and I currently use Amsoil Z-Rod 10w30. I live in SoCal and the temps last weekend were 106*F and my oil temp was around 230-250*F. From reading around, seems most recommend either 10w40 or 20w50. Which would be better for my application? I can't remember the thread, but there was a concern about running a 50 weight in a stock tolerance motor. Any help would be greatly appreciated.
PS my car has 104k miles if that helps.
PS my car has 104k miles if that helps.
#4
EvoM Guru
iTrader: (1)
You'll be fine with 10w30. With the abuse of a tack day, I would put an actual racing oil in the motor. Something like amsoil dominator 10w30.
#5
Evolved Member
iTrader: (2)
A friend just sent me a link to some recent oil testing:
https://540ratblog.wordpress.com/
It's super long but eventually gets to some interesting results.
https://540ratblog.wordpress.com/
It's super long but eventually gets to some interesting results.
#6
EvoM Guru
iTrader: (1)
A friend just sent me a link to some recent oil testing:
https://540ratblog.wordpress.com/
It's super long but eventually gets to some interesting results.
https://540ratblog.wordpress.com/
It's super long but eventually gets to some interesting results.
153. 5W40 SHELL ROTELLA T6 Diesel Oil, synthetic, API CJ-4, CI-4 Plus, CI-4, CH-4, SM, SL = 67,804 psi
zinc = TBD
phos = TBD
moly = TBD
I'm glad to see amsoil scored well in his tests.
#7
EvoM Guru
iTrader: (1)
Nice article, stupid long but didn't take long to find some good info in there. Maybe Ill switch back over to Mobile 1 5w30 since its easy to get and #5 on the list.
I did find the max RPM section interesting. Build 2.3/2.4 at 90 f/s would be 8230rpms. I'm babying it at 7800!
94mm crank would be 8750.
I did find the max RPM section interesting. Build 2.3/2.4 at 90 f/s would be 8230rpms. I'm babying it at 7800!
94mm crank would be 8750.
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#10
Evolved Member
iTrader: (2)
Nice article, stupid long but didn't take long to find some good info in there. Maybe Ill switch back over to Mobile 1 5w30 since its easy to get and #5 on the list.
I did find the max RPM section interesting. Build 2.3/2.4 at 90 f/s would be 8230rpms. I'm babying it at 7800!
94mm crank would be 8750.
I did find the max RPM section interesting. Build 2.3/2.4 at 90 f/s would be 8230rpms. I'm babying it at 7800!
94mm crank would be 8750.
TL;DR for the OP.
neither 10w40 nor 20w50 seem like the correct oil to run based on that guy's advice. mobil1 5w30 (new formulation with dexos1 approval) is one of the highest ranked oils in his testing.
Last edited by griceiv; Jun 7, 2016 at 02:51 AM. Reason: adding non off topic content
#12
Evolved Member
iTrader: (29)
A friend just sent me a link to some recent oil testing:
https://540ratblog.wordpress.com/
It's super long but eventually gets to some interesting results.
https://540ratblog.wordpress.com/
It's super long but eventually gets to some interesting results.
I've done track days with ZROD and immediately sent out the oil for UOA.
https://r56hs.com/2015/10/25/evo-uoa-3/
looked perfectly fine. I am switching to redline 5w30 though moving forward. i'll know for sure by july, but IMO better additive package, slightly higher (thicker) viscosity at 100cst, lower viscosity at 40cst, and better HTHS number (crucial for our cars)
::
to be specifically on topic - stock block, stock head, I think 30wt oil is good.