So I did an oil change on Sat, and added 16 oz of Archoil 9100 to fresh T6. I have always ran T6 in this truck since new. I noticed this morning, that I now have a large spot of oil on the floor of my garage. It is about this size of 4 dollar bills lined up on the floor. I have not driven the truck since Sunday, its not uncommon for the truck to sit for a month at a time in the summer. I had a bed plate leak fixed a couple years back, and have not had any oil leaks since then. Any suggestions?