What does '+.25 Oversized' mean for these bearings?

This means the bearings are slightly larger than standard size. They are designed to be used when the engine's crankshaft journals have been machined down by 0.025 inches (or 0.25mm) during an engine rebuild. This restores proper oil clearance.

What is the advantage of bi-metal aluminum material?

Bi-metal aluminum bearings offer a good balance of strength and conformability. This material is well-suited for the demands of low to medium-load engines and is also lead-free, making it an environmentally safer choice.

Are these bearings suitable for high-performance or racing engines?

These bearings are specifically noted as ideal for low to medium-load engines. For high-performance or racing applications, you would typically look for bearings with different material compositions and load ratings.

Specifications

Brand: King Engine Bearings
Part #: MB5566AM0.25
UPC: 611500205019

King Engine Bearings Audi A4 1.8L AEB (Size +.25 Oversized) Main Bearing Set

Name: King Engine Bearings Audi A4 1.8L AEB (Size +.25 Oversized) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-audi-a4-1-8l-aeb-size-25-oversized-mai-t14-364276
Price: 36.98 USD
Availability: BackOrder

$36.98

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King Engine Bearings Audi A4 1.8L AEB (Size +.25 Oversized) Main Bearing Set. Bi-metal aluminum material for low to medium-load engines.

Key Features

Fits a wide range of Audi and Volkswagen vehicles.
Main bearing set is +.25 oversized for machined crankshaft journals.
Constructed from bi-metal aluminum material.
Lead-free and environmentally safe composite.
Ideal for low to medium-load engines.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

King Engine Bearings has been specializing in making high-quality engine bearings since 1960. This main bearing set, part number MB5566AM0.25, is a +.25 oversized set designed for engines like the 1.8L AEB found in vehicles such as the Audi A4 Quattro, Volkswagen Golf, and Jetta. These bearings are built with a bi-metal aluminum material that is lead-free and environmentally safe, making them a solid option for low to medium-load engines.

The bi-metal construction offers good performance for everyday driving and moderate use. Because these are oversized bearings, they are intended for use when the crankshaft journals have been machined down to accommodate them, typically during an engine rebuild to restore proper clearances. Always refer to your vehicle's service manual for specific installation procedures and journal machining requirements.