What does '0.010 inch undersize' mean for these piston rings?

This means the rings are manufactured to be 0.010 inches smaller in diameter than standard size. They are intended for use in engines where the cylinders have been bored out by 0.010 inches during a rebuild to restore proper fit and compression.

Are these piston rings compatible with all 4.4L Northstar engines?

This specific Mahle ring set is designed for the 4.4L LC3 Northstar V8 engine found in the 2006-2009 Cadillac STS-V and XLR-V models. Always verify fitment for your specific vehicle's engine code.

Can these rings be shipped to California?

No, these Mahle piston rings are not CARB approved and cannot be shipped to California due to emissions regulations.

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-t14-49410
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, designed to reduce friction and oil consumption.

Key Features

Fits 2006-2009 Cadillac STS and XLR models.
Designed for the 4.4L LC3 Northstar engine.
Moly ring set is 0.010 inch undersize for bored cylinders.
Helps reduce engine friction and oil consumption.
Built to OE specifications for reliable performance.
Offers longer service life due to advanced design.

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Product Details

These Mahle Moly piston rings are 0.010 inch undersize, meaning they're built to fit engines that have been bored out slightly during a rebuild. They're specifically made for the 4.4L LC3 Northstar V8 found in the 2006-2009 Cadillac STS-V and XLR-V models. When you're rebuilding the top end of one of these performance engines, getting the right piston rings is crucial for proper sealing and long-term health.

Mahle designs these rings with OE requirements in mind, focusing on reducing friction between the piston and cylinder wall. This not only helps the engine run a bit smoother but also contributes to minimizing oil consumption, which is important for keeping emissions in check and ensuring the engine doesn't burn through too much oil over time. The moly coating on these rings helps with initial break-in and provides a durable surface for extended service life.

If you're in the middle of a performance engine rebuild for your STS-V or XLR-V, this set is a solid option. Just remember that these rings are not CARB approved, so they cannot be shipped to California.