Detect Hidden Oil Use in Aging Engines

Cost Savings

Checklist Tasks

• Check oil dipstick after a recent change to spot rapid oil loss.
• Inspect oil filler cap for sludge or milky residue that indicates leaks or coolant mixing.
• Examine spark plug tips for oily deposits to detect oil entering combustion chamber.
• Look for blue smoke at cold start or acceleration as a sign of burning oil.
• Wipe tailpipe with a white cloth for oily soot, revealing incomplete oil combustion.
• Look under engine and transmission for fresh oil drips or stains indicating leaks.
• Review service records for frequent top-offs or short intervals revealing chronic use.
• Listen at idle for ticking/knocking that can signal low oil pressure from loss.
• Check PCV valve and hoses for clogs or oil residue that worsen oil loss.
• Monitor oil pressure gauge or warning light during a 20-minute drive for changes.
• Remove air intake hose to check for oil pooling inside as a sign of blow-by.
• Ask seller for oil purchase receipts between changes, revealing undocumented top-ups.