5 qts of 5w20 and 2qts of 5w30!
!!! will i be ok or do i need to drain the oil and start over?? please help!!
06-27-2012, 07:50 AM
#16
Moderator (Ret.)
Switching to a higher oil viscocity in these engines may not be a factor, but in the new generation engines, I'd be careful. I also own a 2011 Mustang with the TiVCT (variable valve timing) which works off of oil pressure. It was engineered to work with the oil pressures that 5w-20 provide. Many Ford tech mechanics on the Mustang forum have informed members there that using a higher viscosity oil can increase oil pressure when the engine reaches its operating temperature, and can alter this variable valve timing. Damage may occur in the long run. For this reason, I'm sticking to the 5w-20 in the newer engines.
You'll also note that the viscosity chart that used to be in owners manuals is gone. Nolonger is it suggested to use different oil viscosities depending on warm or cold climates anymore.
You'll also note that the viscosity chart that used to be in owners manuals is gone. Nolonger is it suggested to use different oil viscosities depending on warm or cold climates anymore.
Last edited by Mod (Ret.); 06-27-2012 at 07:54 AM.
06-27-2012, 04:14 PM
#17
The 5 in 5w30 makes the 2 oils identical at startup (cold flow)... After operating temp is reached 5w-30 has a greater kinematic viscosity at 190 degrees then 5w20... At about 215 to 220 degrees the kinematic viscosity of the 2 oils is exactly the same... The 5w30 will end up being only slightly thicker at operating temp then 5w20....the idea here is greater protection from oil film rupture or shearing, especially in an overheated oil or engine scenario....
Mpg differences between the 2 oils are almost undetectable. But you can't beat the protection 5w30 offers over 5w20 in the 5.4 3v IMHO.
Mpg differences between the 2 oils are almost undetectable. But you can't beat the protection 5w30 offers over 5w20 in the 5.4 3v IMHO.
06-27-2012, 04:23 PM
#18
Switching to a higher oil viscocity in these engines may not be a factor, but in the new generation engines, I'd be careful. I also own a 2011 Mustang with the TiVCT (variable valve timing) which works off of oil pressure. It was engineered to work with the oil pressures that 5w-20 provide. Many Ford tech mechanics on the Mustang forum have informed members there that using a higher viscosity oil can increase oil pressure when the engine reaches its operating temperature, and can alter this variable valve timing. Damage may occur in the long run. For this reason, I'm sticking to the 5w-20 in the newer engines.
You'll also note that the viscosity chart that used to be in owners manuals is gone. Nolonger is it suggested to use different oil viscosities depending on warm or cold climates anymore.
You'll also note that the viscosity chart that used to be in owners manuals is gone. Nolonger is it suggested to use different oil viscosities depending on warm or cold climates anymore.
06-27-2012, 05:19 PM
#19
Moderator (Ret.)
Use what you want. On the newer engines with the TiVCT setup, I'm sticking with 5w-20.
I don't wish to start a rant on this subject. I will not read nor debate it further.