Does a 2005 Cadillac STS northstar engine burn oil?

The Northstar engine in the 2005 Cadillac STS, like many high-performance engines of its era, has a reputation for potentially burning oil, but it's not a guaranteed issue. Some experience no significant oil consumption, while others experience excessive burning. Several factors contribute:

* Valve stem seals: These are a common culprit in older Northstars. As they wear, they allow oil to leak past the valves and burn in the combustion chamber.

* Piston rings: Worn piston rings can also lead to oil burning.

* PCV system: Problems with the Positive Crankcase Ventilation system can cause excessive crankcase pressure, forcing oil past seals.

* Maintenance: Regular maintenance, including oil changes with the correct weight oil, is crucial. Neglecting maintenance significantly increases the risk of oil burning.

Therefore, you can't definitively say that *all* 2005 Cadillac STS Northstar engines burn oil. However, it's a known potential problem, and a buyer should be aware of this possibility and check for signs of oil consumption before purchasing one. A thorough inspection, including a compression test and a check of the oil level and condition, is recommended.