Gasoline/motor fuels are a fast depleted/replenished commodity so they are more price sensitive. Motor oil has lower 'traffic' so it is no so sensitive - but- when prices go up they rarely come down fast.
Been to a grocery store lately? The lower fertilizer prices have not affected the food chain for meat production yet and wont for months. Some, price sensitive produce, trucked here from Mexico, has come down in price -- I bought a quart of Mexico grown strawberries for $1.67 yesterday but it was a price loss leader probably. Lower diesel fuel prices help make this possible -- so there is some 'trickle down' affect perhaps.
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