Had my oil changed at my regular shop. I trust these guys they always do a good job. But today one of the mechanics picked up one of the empty bottles of the Schaeffers 7000 I'm using and started reading the label, said he had never heard of this brand before. I tried to give him a little history on the company. Then he saw the word "paraffin" on the label. They gave me a look like I was putting unrefined crude in my engine. Made a remark about Valvoline not having this stuff in it and walked away. Old myths die hard.