What does the '0.040' in the part number mean?

The '.040' in the part number indicates that this piston ring set is 0.040 inches undersize. This sizing is typically used when the engine's cylinder walls have been bored out during a rebuild to ensure a proper fit.

Are these rings suitable for all 4.4L Northstar engines?

This specific Mahle ring set is designed for the 4.4L LC3 Northstar engine found in the 2006-2009 Cadillac STS-V and XLR-V. It's important to confirm your vehicle's exact model and year to ensure compatibility.

What is the benefit of a moly-coated piston ring?

Moly (molybdenum) coating on piston rings helps to reduce friction between the ring and the cylinder wall. This leads to less wear on both components, improved oil control, and can contribute to better engine efficiency and a longer service life.

2006-2009 Cadillac STS Piston Rings

Name: Mahle Rings GM 4.4L LC3 2006-2009 Cadillac STS-V / XLR-V Northstar Engine Moly Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-gm-4-4l-lc3-2006-2009-cadillac-sts-v-xlr-v-northstar-engine-t14-49413
Price: 169.96 USD
Availability: BackOrder

Mahle Rings GM 4.4L LC3 2006-2009 Cadillac STS-V / XLR-V Northstar Engine Moly Ring Set

$169.96

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2006-2009 Cadillac STS-V and XLR-V. Mahle OE Moly Ring Set for 4.4L LC3 Northstar engines.

Key Features

Fits 2006-2009 Cadillac STS and XLR models with the 4.4L LC3 Northstar engine.
Moly coating on the top ring reduces friction and wear for improved longevity.
Designed to meet original equipment manufacturer (OE) requirements.
Helps minimize engine oil consumption and maintain proper compression.
This set is 0.040 inches undersize for specific engine rebuild applications.
Mahle OE is a well-known supplier for factory-replacement engine components.

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Product Details

These Mahle Moly Ring sets are built to the original equipment specifications for your 2006-2009 Cadillac STS-V or XLR-V with the 4.4L LC3 Northstar engine. When you're rebuilding the top end of your engine, new piston rings are a critical part of ensuring proper compression and oil control. Mahle designs these rings to minimize friction and oil consumption, which helps extend the life of your engine and maintain its performance.

The moly coating on the top ring is a key feature here. This coating helps reduce friction between the piston ring and the cylinder wall, leading to less wear over time and improved efficiency. This is especially important in high-performance engines like the Northstar V8 found in these Cadillacs. Mahle's focus on OE requirements means you're getting a part that's designed to work seamlessly with your engine's components, ensuring a solid seal and reliable operation.

When installing these rings, remember they are sized at 0.040 inches undersize. Always refer to your vehicle's service manual for the correct installation procedures and specifications to ensure a proper fit and optimal performance.