Quote Originally Posted by Triathlete View Post
Running overly thick oil in our VXs can lead to issues with the already to small piston oil drain holes clogging which can lead to engine death.
That said, I have ran mobil1 as long as I have owned my VX. I think as long as you change your oil as recommended the brand/type is of less important than vescosity. I am surprised your mech recommended thicker oil in a cooler climate?
Isn't 10w-30 the recommended oil from Isuzu?