2004 CADILLAC Seville LZ4/LR4 (STS)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Northstar engine timing chain tensioner failure
• Oil leaks from valve cover gaskets

First checks

• Inspect cooling system for leaks due to aging components
• Check for oil sludge in engine and change interval history

Avant de remplacer des pièces

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• Supercharged LR4 engine was a late 2004 model year introduction mainly for US and Canadian markets.
• No official export markets beyond North America had unique engine configurations widely documented.