Thanks for all the advice. I will replace it all with AG60 and hopefully don't break.
I noticed the one close to the turbo is in a metal protector. Do I need a special socket or any deep socket will do the trick?
I had my truck for five years and going on the sixth winter.
Last winter I noticed it required more effort to start and lots of smoke and shaking at startup for a few minutes. I'm sure there is at least one GP which does not work. No problem now to start but I don't want to go through the...