I've been getting Mobil 1 EP at Walmart, they usually have quarts and 5 quart jugs considerably cheaper than anywhere else.

 

Heat is the biggest factor.

You got off easy for 70 in labor, what was the agreed price if he broke any plugs?

 

It was $70 even if he broke any plugs. When I worked at my families Wrecking yard he would come looking for parts all the time. I would even let him take parts on credit. So we had a really great business relationship that turned into an awesome friendship. He refilled my AC after I fixed my truck too.