In February of this year, I covered HF Sinclair (NYSE: DINO ) with a sell rating. This was mainly attributed to the company's high operating expense per barrel in the face of diminishing margins in PADD 3 andI am a Licensed Professional Engineer who works in the Nuclear Power industry. I use my professional working knowledge of the power/energy industries to aid in evaluating potential equities worthy of long-term investment. I invest in income producing equities and rental real estate properties for cash f ...