I have been researching Synthetic oil....The reason, is my wife was told that the last time she had an oil change the receipt said they used Synthetic, and the oil guy said she shouldn't because the seals have been used to regular oil for the 60K miles she has had the car. He said that using Synthetic would cause the seals to leak.
I found some reference to this, but most say that synthetic should be used anyway because the synthetic will still give more protection to the engine. This is true because not only is it a better lubricant, but that it coats the pistons all the time so you get no wear (or less wear) upon start up. It also works better at high temps that you may get when the engine is under strain. Reports of better gas mileage and higher power also surface.
I have on vehicle with 60K miles, another with 85k miles and another with 110k miles...I am thinking about changing all of them. Some say you should, but do engine flushes first in order to get all "contaminated" regular oil out of the car, others say the idea of a engine flush is bunk because on older engines, the deposits in the engine may just be solving problems and you should leave them there.
Does anyone know what is really true? Also it appears that Amsoil, and Mobile 1 are the preferred choices. Your thoughts are appreciated!
THANKS
I found some reference to this, but most say that synthetic should be used anyway because the synthetic will still give more protection to the engine. This is true because not only is it a better lubricant, but that it coats the pistons all the time so you get no wear (or less wear) upon start up. It also works better at high temps that you may get when the engine is under strain. Reports of better gas mileage and higher power also surface.
I have on vehicle with 60K miles, another with 85k miles and another with 110k miles...I am thinking about changing all of them. Some say you should, but do engine flushes first in order to get all "contaminated" regular oil out of the car, others say the idea of a engine flush is bunk because on older engines, the deposits in the engine may just be solving problems and you should leave them there.
Does anyone know what is really true? Also it appears that Amsoil, and Mobile 1 are the preferred choices. Your thoughts are appreciated!
THANKS