What is the main benefit of plasma moly rings?

Plasma moly rings, like the top ring in this set, offer improved wear resistance compared to plain cast iron. This helps them maintain a good seal against the cylinder wall for longer, especially in engines that see frequent use or higher operating temperatures.

Why is a low-tension oil ring used?

A low-tension oil ring is designed to apply less pressure against the cylinder wall. This reduces friction, which can lead to slightly better fuel economy and a small increase in horsepower by freeing up parasitic drag.

What does the '0.015' in the part number signify?

The '.015' in the part number typically indicates that these rings are 0.015 inches oversized for the piston. This is common when rebuilding an engine where the cylinders have been bored out to a larger diameter.

Mahle Piston Ring Set 3150204.015 - Engine Components

Name: Mahle Rings Ductile Plasma Moly 1.5 1.5 3.0MM x 4.135in Low Tension Oil Ring Engine Moly Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-ductile-plasma-moly-1-5-1-5-3-0mm-x-4-135in-low-tension-oil-t14-49991
Price: 205.59 USD
Availability: BackOrder

Mahle Rings Ductile Plasma Moly 1.5 1.5 3.0MM x 4.135in Low Tension Oil Ring Engine Moly Ring Set

$205.59

On Backorder

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

Mahle OE Piston Ring Set 3150204.015. Ductile plasma moly rings for engine rebuilds. Verified fitment.

Key Features

Fits engines with a 4.135-inch bore.
Features a ductile iron plasma moly top ring for wear resistance and sealing.
Includes a 1.5mm second ring and a 3.0mm low-tension oil ring.
Low-tension oil ring helps reduce friction and improve efficiency.
Mahle OE quality for reliable engine performance.

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Product Details

When you're rebuilding the top end of your engine, getting the right piston rings is crucial for sealing combustion and controlling oil. This Mahle OE Moly Ring Set is built for that job, featuring a ductile iron plasma moly top ring and a 1.5mm second ring, paired with a 3.0mm low-tension oil ring. These dimensions are specific to certain engine builds, ensuring a precise fit for optimal performance.

Mahle is a well-known name in engine components, and this set reflects that. The ductile plasma moly construction on the top ring offers good wear resistance and helps maintain a solid seal against the cylinder wall, even under demanding conditions. The low-tension oil ring is designed to reduce drag, which can contribute to improved fuel economy and a bit more power. These rings are made to fit a 4.135-inch bore, a common size for many performance or heavy-duty engine applications.

When installing these, remember that proper cylinder wall preparation and ring gap setting are key to a successful rebuild. Always refer to your engine's specific service manual for detailed installation procedures and specifications.