Possible Clues:

• Saturated vegetable fat
• Friend with limo adapted for biofuel
• Conceal grease, which is found in margarine
• Edible plant extract
• Product of tropical tree offered as bribe, perhaps?
• Handy sort of lubricant
• Suitable lubricant to have on hand
• Bribe with hand lotion?
• Source of saturated fat
• Broken lamp from Greece reportedly found in saturated fat