Originally Posted by ZeeOSix
Originally Posted by userfriendly
With all the goo goo and ga ga threads about HTHS viscosity, base oil viscosity etc in the last few weeks, lets talk about post permanent shear high temperature protection.
The PDS tells us how the engine oil performs when fresh, but how about towards the end of the oil drain interval?
HTHS typically follows KV100 fairly well, so if an oil shears down with mileage I'd say the HTHS is also reduced by a similar degree.
That's why I use 5W-30 instead of xW-20. I want HTHS headroom for any shearing, and for any driving conditions that might elevate oil temperature.
THANK YOU!
EXACTLY WHY I go to a NOT a Ford USDM (5W-20) recommended viscosity in the heat of summer, and use a medium HTHSV 5W-30, especially since the way I use my car (NOT a granny driven Camry/Avalon), the fuel diluting 1.6 liter, power dense, direct injected turbo, with a known marginal factory cooling system, and that I use a full bottom of engine/sump covering skid plate during the summer.
Originally Posted by userfriendly
With all the goo goo and ga ga threads about HTHS viscosity, base oil viscosity etc in the last few weeks, lets talk about post permanent shear high temperature protection.
The PDS tells us how the engine oil performs when fresh, but how about towards the end of the oil drain interval?
HTHS typically follows KV100 fairly well, so if an oil shears down with mileage I'd say the HTHS is also reduced by a similar degree.
That's why I use 5W-30 instead of xW-20. I want HTHS headroom for any shearing, and for any driving conditions that might elevate oil temperature.
THANK YOU!
EXACTLY WHY I go to a NOT a Ford USDM (5W-20) recommended viscosity in the heat of summer, and use a medium HTHSV 5W-30, especially since the way I use my car (NOT a granny driven Camry/Avalon), the fuel diluting 1.6 liter, power dense, direct injected turbo, with a known marginal factory cooling system, and that I use a full bottom of engine/sump covering skid plate during the summer.