Just had my oil changed at one of those damn Jiffly lubes. I was in a pinch and had to go to the idiots. They put shell 15-40 in and it eneded up having a leaky filter and I tightened it and cleanded it off so I thought, I still smell the awful smell of what smells like 90wt gear oil. What could it be? I used simple green liberally and hosed it off. I see no oil.