Originally Posted by e3NiNe
do not switch to synth if your car is over 50K.
synth is thinner, so it doesn't coat as well. older engines need the most protection due to wear and tear.
It's a very large misconception that thicker oil coats and will protect an older engine better at start-up. The opposite is true: thinner oils flow better and quicker, lubricating the engine quicker.