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MAHLE 4040-300S 4.040" Bore 3.0mm Oil Ring Expander Standard Tension

Part of: MAHLE Bore Oil Ring Expander Standard Tension

Other options in this family: MAHLE 4050-300S MAHLE 4030-300S MAHLE 4135-300-S MAHLE 4155-300S MAHLE 4145-300S

Manufacturer

Picture for manufacturer MAHLE

Part Number

4040-300S
11 reviews
Sale Price

$14.27

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The MAHLE 4040-300S is a precision-engineered oil ring expander designed for high-performance engine builds requiring a 4.040" bore diameter. This standard tension expander works in conjunction with oil control rings to maintain optimal oil film thickness on cylinder walls while preventing excessive oil consumption.

Key Specifications:

  • Bore Size: 4.040 inches
  • Width: 3.0mm
  • Tension: Standard
  • Precision-manufactured for consistent ring pressure
  • Compatible with MAHLE oil ring sets

Oil ring expanders are critical components that provide the outward radial force necessary to keep oil control rings properly seated against the cylinder wall. The 4.040" bore size makes this expander suitable for popular small block and big block engine applications that have been bored to this dimension. MAHLE's manufacturing expertise ensures consistent tension characteristics and dimensional accuracy for reliable long-term performance.

Products specifications

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Picture was different then real product had to call to confirm fitment and was giving good answers.

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