Turtle n Peeps wrote:Redsky wrote:
Synthetics can be worse for engines operating under high temperatures. almost all of them are 5W40 formulations and the engine manufacturers specify this weight for sub zero driving conditions and air temperatures under 90F degrees. In hotter weather they specify a 15W40 motor oil regardless of whether it is a mineral/dino or synthetic motor oil. You do not want to be starting the engine with a 5W oil on a 100 degree day and waiting for it reach 15W to be properly lubricating the engine bearings.
You do not have any understanding on how a multi grade oil works.
