My Account
My Garage
Shopping Cart
MY GARAGE Select Vehicle
MY GARAGE

MAHLE 4255MS-15 Piston Ring Set Bore File Fit - 4.250 1.5mm 1.5mm 3.0mm

Manufacturer

Part Number

4255MS-15
Sale Price

$149.33

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The MAHLE 4255MS-15 is a premium piston ring set engineered for high-performance engine builds requiring precise bore specifications. This ring set is designed for a 4.250-inch bore diameter with an additional 0.005-inch oversize tolerance, making it ideal for engines that have been bored or honed to exact specifications.

Ring Configuration:

  • Top compression ring: 1.5mm thickness
  • Second compression ring: 1.5mm thickness
  • Oil control ring: 3.0mm thickness

Key Features:

  • File-fit design allows custom end-gap adjustment for optimal ring seal and performance
  • Precision-manufactured to MAHLE's OEM quality standards
  • Engineered for durability and consistent sealing under high-stress conditions
  • Suitable for performance rebuilds, racing applications, and precision engine assembly

MAHLE's file-fit piston rings give engine builders the flexibility to precisely set ring end gaps according to specific engine requirements, ensuring proper compression sealing and oil control. This level of customization is essential for optimizing engine performance and longevity in demanding applications.

Products specifications

Bore (in)

4.250 in.

Bore (mm)

107.950mm

File Fit

Yes

Gapless

No

Oil Ring Included

Yes

Oil Ring Material

Stainless steel

Oil Ring Tension

Standard

Oil Ring Thickness

3.0mm

Quantity

Sold as a set.

Second Ring Facing Material

Cast iron

Second Ring Included

Yes

Second Ring Material

Cast iron

Second Ring Thickness

1.5mm

Top Ring Facing Material

Plasma-moly

Top Ring Included

Yes

Top Ring Material

Ductile iron

Top Ring Thickness

1.5mm

Prop 65

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

Piston Ring Thickness

1.5mm, 1.5mm, 3.0mm

They had great email communication and shipped my items from order number 14199 very quickly. I was very impressed with how they handled my order.

Very easy

Damn fast on the shipping and great price on the item a great place to shop

Great company to order from! Low prices, wide variety of merchandise, and quick shipping!

Great Clutch kit I got, did have to contact customer sevice to see if my item shipped but was very nice about it. I would do business with them again. Item shipped quickly. Great price to.

I was looking for a present for my husband, and Autoplicity had the items way cheaper than any other site. And then I messaged them to see if they had any coupons available, and I was sent a coupon code right away. I will definitely shop here again for auto supplies.

best price i can find. shipping scheduled only 4days after i order. haven't received it but looks fast.

Great prices, quick ship thanks!

This was my second order with Autoplicity. The first order I had to call to get an update, but just happens the part was out for delivery the day I had called. This second order went without a hitch! In both cases, shipping was fast and the products delivered at great prices, not to mention some of the best prices on shipping. I will definitely look here for my future parts needs!!

i was advised by all internet sources, and the manufacturer that the part i needed was out-of-stock and discontinued, when i used google shopping, autoplicity not only had the part but they were the most reasonably priced! my order was delivered to my door in 3 days. color me a satisfied customer, and yes i will used autoplicity again, soon!

Autoplicity has really good service. They give you such good prices and yet they're still willing to give you discounts on your purchases. They emailed me a day later after purchase with shipping number. I would recommend them to anyone!

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy