What does the .020 in the part number mean?

The '.020' in the part number indicates that these rings are 0.020 inches undersize. This means they are intended for use when the engine cylinders have been bored out by 0.020 inches during a rebuild.

What is the benefit of moly coating on piston rings?

Moly coating on piston rings helps with the initial break-in process by providing a smoother surface. It also contributes to reduced friction and wear over the life of the ring, potentially leading to a longer service interval.

Are these rings compatible with all 4.4L Northstar engines?

These Mahle OE rings are specifically designed for the 4.4L LC3 Northstar engine found in the 2006-2009 Cadillac STS-V and XLR-V. Always confirm your specific engine code before ordering.

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-t14-49411
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. Mahle OE Moly Ring Set for the 4.4L LC3 Northstar engine, designed to reduce friction and oil consumption.

Key Features

Fits 2006-2009 Cadillac STS and 2006-2009 Cadillac XLR.
Designed for the GM 4.4L LC3 Northstar engine.
Moly coated for improved break-in and longer service life.
Helps reduce engine friction and oil consumption.
This is a 0.020 inch undersize ring set.

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Product Details

If you're rebuilding the top end of your 2006-2009 Cadillac STS or XLR with the 4.4L LC3 Northstar engine, a fresh set of piston rings is crucial. These Mahle OE Moly Ring Sets are built to meet the demands of that specific engine, helping to ensure proper sealing between the piston and cylinder wall. Getting this seal right is key to preventing oil from getting into the combustion chamber and keeping combustion pressure where it belongs.

Mahle engineers these rings with a focus on reducing friction, which can help improve efficiency and potentially extend the life of your engine. They also work to minimize oil consumption, a common concern with higher-mileage engines. The moly coating on these rings helps with initial break-in and can contribute to a longer service life by reducing wear.

This set is specifically sized at 0.020 inches undersize, which is important to note if you are re-boring your cylinders. Always refer to your vehicle's service manual for the correct ring set and installation procedures.