Gaskets and Seals› Engine Gaskets and Seals

Nissan

Rear Main Oil Seal

$50.77

SKU: 12279AD205

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Nissan 12279-AD205 is a rear main oil seal designed for precise fitment in various Nissan and Infiniti engines. This component acts as a critical crankshaft seal, ensuring oil is contained within the engine block to prevent leaks and maintain proper lubrication.

As a genuine OEM replacement part, it is manufactured to original factory specifications for consistent performance and durability. It serves as a direct replacement for multiple part numbers, including 12279-1N500 and 12279-77A05.
Show original supplier description
The Nissan 12279-AD205 is a rear main oil seal engineered to provide a tight, reliable barrier between the crankshaft and the engine block. By effectively containing engine oil, this critical component helps prevent leaks and maintains the integrity of the powertrain, making it essential for routine engine maintenance or repairs. This genuine OEM seal is manufactured to meet stringent factory standards, ensuring it aligns perfectly with your vehicle's specifications. Being a direct-replacement part, it is designed for compatibility with a wide range of legacy Nissan and Infiniti models, including various 200SX, 300ZX, Frontier, Maxima, Pathfinder, and Sentra configurations spanning from the 1980s through the early 2000s. Because this component involves access to the rear of the crankshaft, installation typically requires significant disassembly of the drivetrain or transmission. Due to the technical nature of this repair, professional installation is often recommended to ensure proper seating and seal integrity. This part comes backed by the standard Nissan factory warranty, providing assurance of quality and fitment reliability compared to aftermarket alternatives.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandNissan
Part Number12279AD205
CategoryGaskets and Seals
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy