Originally Posted by PowerSurge
Originally Posted by ZeeOSix
Originally Posted by PowerSurge
Originally Posted by ZeeOSix
Just asking for some proof of the claim. As long as you don't do something crazy like use 20W-50 in -25F start-ups, and there's adequate oil flow - ie, the PD oil pump can effectively pump the oil, meaning the correct/appropriate viscosity is used for the ambient temperature - then start-up wear will not be a strong function (if any) of the viscosity.
So if you (or anyone else) can dig up an official study that shows more start-up wear occurs between xW-20, xW-30, xW-40 and xW-50 as a sole function of those different viscosities when appropriately used for their rated ambient temperature, then I'm all ears.
For starters, give this a read:
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3539152/1
Pretty much goes along with what I said above. Can you detect the truth from the fiction in that thread?
You totally ignored Gokhan's posts. That's called cherry picking.
I read his posts, and I'm sure he agrees that there is no real difference in start-up wear due solely to the viscosity factor between 5W-20, 5W-30, 5W-40 and 5W-50 if they are all used in ambient temperatures that they are specified for. There won't be a lack of lubrication (which is what causes wear) due to the fact that they will still flow well and be supplied to moving parts by the positive displacement oil pump. That's my point ... the "5W" is the important spec for cold start-up, not the 20, 30, 40 or 50.