Did anyone notice performance change or difference in engine feel when they switch from 5w-30 oil to 0w-40 esp?

 

No.

 

Only thing I noticed was oil pressure at idle was reduced from 40psi to 35psi. once throttle was increased slightly it returned to 40psi.

 

No. But Im out of warranty and dont give a crap about paying double for oil.

 

I have never used anything other than 5w 30 in every vette I have ever owned. If you're not racing the car on a regular basis, synthetic oil is synthetic oil

 

Kind of an odd question.. Why would you feel, or notice a difference just because of the oil you use? If there was no oil in it, yes you would notice and feel a difference..

 

If you are referring to the old myth of lifter pump up,.....no. Probably not a factor at all and, in any case, would have to really, really be an extreme case.

to wit:

.........Billy Godbold, Valvetrain Design Engineering Chief at Comp Cams feels that enthusiasts are seeing something that might be mistaken for pump-up, and is still a problem that needs to be addressed.

“What we are talking about here is the bleed down rate and effective lash (clearance) that reduces the dynamic duration and stability of a hydraulic roller lifter system at high-RPM,” explains Godbold. “While valve bounce can lead to the hydraulic system holding a valve open, there is not an actual mechanism that can accurately be described as ‘pump-up.’ The valve bounces up, and the dumb hydraulic system just adjusts to hold it up for quite a while.”

“While the bleed down rates definitely change dynamic duration, and it changes based on RPM and all kinds of other influences, we have not seen anything that can accurately be described as ‘pump-up.’ The closest thing we have seen on the Spintron is when you go into severe valve bounce,” Godbold reveals. “Unlike with a solid lifter bounce, which has a natural, symmetric parabolic shape, when you have significant bounce on a hydraulic system the inner piston can move up and hold the valve open for as much as an extra 50 degrees of crank rotation. I believe the guys running engine dynos in the ‘70s through ‘90s would see fuel standoff above the carburetors when this happened, and they knew the intake valve was being held open.”

 

I definitely saw a difference between Mobil 1 15W50 and the Dexos2 ESP 0W40. On track, my engine oil temps dropped by about 5 degrees. When I compare PDR recorded coolant temps from when I ran 15W50 Vs the recordings when I was running 0W40 the temp difference is clear across multiple recordings.

Bill

 

No. All Synthetic oil is not the same.

 

If you are driving the car around town and not racing it there is zero difference… don’t beat this dead horse. Racing absolutely….

 

I agree with you big diff in full race & every day driving on the street. Robert