Possible Clues:

• Saturated vegetable fat
• Conceal grease, which is found in margarine
• Friend with limo adapted for biofuel
• Frying medium
• 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