Related Clues:

• Well output, perhaps
• Squeak quieter
• Alaska's main export
• Castle with a much-kissed stone
• Maintain, as some tools
• Engine additive
• See 24 Across
• OPEC stuff
• Slick liquid
• Atar
• Jett's find in "Giant"
• Dipstick coating
• Qatar export
• It's often changed at garages
• See 44 Down