Trivia:
Light Louisiana Sweet (LLS) is a low viscosity (light) low sulphur (sweet) crude produced in the Gulf of Mexico
Mars is also produced in the GoM but it's thicker and has more sulphur (Mars is considered a medium sour crude)
So Mars blend is supposedly a lower quality crude so it trades at a discount to LLS (or we can say LLS trades at a premium to Mars)
But many US refiners can only process heavy crudes and because there's now less supply of heavy crudes (due to OPEC+ cuts and sanctions on Venezuela) the price gap between LLS and Mars has almost disappeared
(meaning Mars is becoming more expensive coz US refiners that import Venezuela's oil will have to switch to Mars or other alternatives)
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