Oil Seals | Mercruiser Engine

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Home > Inboard > Mercruiser Engine > Internal Engine | Mercruiser Engine > Gaskets & Gasket Sets | Mercruiser Engine > Oil Seals | Mercruiser Engine

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Seal Rear Main

GM 496 8.1L Std Rotation

Item#:

496RS

Cross Reference#:

881608
881608001

Manufacturer Item:

881608001

Manufacturer:

Aftermarket

Available:

In Stock

Your Price:

92.24

Each

Qty:

Rear Main Oil Seal

Mercruiser 3.7L & Ford 351ci w/1Pc Standard Rotation

Item#:

18-0864

Cross Reference#:

67389
9-61623
90925

Manufacturer Item:

90925

Manufacturer:

Sierra

Available:

In Stock

Your Price:

57.09

Each

Qty:

Mercury MerCruiser Oil Drain Plug O-Ring 863006

OEM Oil Drain Plug Seal for Mercury & MerCruiser Engines

OEM Mercury & MerCruiser Oil Drain Plug Seal

Mercury MerCruiser Oil Drain Plug O-Ring 863006

The Mercury MerCruiser 863006 Oil Drain Plug O-Ring is an OEM replacement seal used across a wide range of Mercury outboards, Verado engines, MerCruiser sterndrives, and inboard marine engines.

This O-ring seals the oil drain plug assembly and helps prevent oil leaks during operation and after routine oil service.

Fitment Overview

OEM part number 863006 is used across numerous Mercury and MerCruiser oil drain plug applications. Unlike the drain plug assembly itself, this seal is shared across multiple engine families and marine platforms.

This includes Mercury EFI outboards, Verado engines, V6/V8/V10 outboards, MerCruiser sterndrive engines, and select inboard marine engines.

Compatibility

Application	Models / Engine Families
Mercury EFI 4-Stroke Outboards	65HP through 150HP EFI models
Mercury V6 Outboards	3.4L V6 175HP and 200HP
Mercury V8 Outboards	4.6L V8 200HP through 300HP
Mercury V10 Outboards	350HP 400HP 425HP models
Mercury Racing	300R 450R 500R Verado applications
MerCruiser Sterndrive Engines	Multiple GM-based marine engine platforms
MerCruiser Inboard Engines	Select inboard oil drain plug applications

Always verify fitment using your engine serial number or existing part number before ordering.

Associated Oil Drain Plug Assemblies

Important: If your oil drain plug assembly is cracked, damaged, stripped, or leaking around the housing itself, replacing only the O-ring may not solve the problem.

In those cases, replacing the complete drain plug assembly is recommended:

View Mercury 8M0112869 Oil Drain Plug Assembly

Part Numbers and Cross References

Type	Part Number
Mercury OEM	863006
Associated Drain Plug Assembly	8M0112869
Related Drain Plug Assemblies	8M0064964, 8M0045813

What This O-Ring Is Used For

This O-ring seals the oil drain plug assembly to prevent oil leaks and seepage. Over time, heat cycles, oil exposure, and repeated removal during oil changes can flatten or damage the seal.

Seals engine oil drain plug assemblies
Helps prevent oil leaks after service
OEM Mercury and MerCruiser replacement seal
Often replaced during routine oil maintenance

Replacing the O-ring during oil service is often the easiest and most affordable way to prevent future leaks.

System Function and Connections

System Type: Engine lubrication / oil drain system
Component Type: Oil drain plug O-ring seal
Associated Components: Oil drain plug assemblies and oil pan drain systems
Location: Oil drain plug sealing surface

FAQ

What does the 863006 O-ring fit?
It fits many Mercury and MerCruiser oil drain plug applications including EFI outboards, Verado engines, V6/V8/V10 outboards, and select sterndrive and inboard engines.

Can I replace just the O-ring instead of the entire drain plug assembly?
Yes. If the drain plug assembly itself is still in good condition and only the seal is leaking, replacing the O-ring is often the simplest repair.

When should I replace the full drain plug assembly?
Replace the entire assembly if the plug is cracked, stripped, damaged, or leaking around the plug body itself.

What drain plug assembly commonly uses this O-ring?
One common associated assembly is the Mercury 8M0112869 Oil Drain Plug Assembly .

Dealer Discounts & Store Policies

Dealer / Marine Industry Discounts

Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.

Apply for a Dealer Account

Shipping Policy

Free shipping on orders over $100 (continental U.S.).
Orders ship via UPS, USPS, and FedEx.
Orders received before 5:30 PM EST ship the same business day.
Typical delivery time is 1–5 business days.

30-Day Return Policy

Returns accepted within 30 days of delivery.
Items must be new, unused, and in original packaging.
Return authorization is required before sending items back.

Need help with a return or order question?
Contact Us
Phone: 941-721-3000

Searchable Part Numbers

863006, Mercury oil drain plug o-ring, Mercury oil plug seal, MerCruiser oil drain seal, Mercury Verado oil plug o-ring, Mercury V6 oil seal, Mercury V8 oil drain plug seal, Mercury V10 oil plug seal, 8M0112869, Mercury oil drain plug gasket

Item#:

863006

Manufacturer Item:

863006

Manufacturer:

Mercury Marine

Available:

In Stock

Your Price:

2.59

Each

Qty:

Oil Seal, Upper Crankshaft

Mercury 70-125 L3 L4 Bravo XR XZ Yoke Seal

Item#:

1443

Cross Reference#:

18-0523
18-2074
43993
509229
509229
8M0214932
85090

Manufacturer Item:

43993

Manufacturer:

Pro Marine

Available:

In Stock

Your Price:

8.56

Each

Qty:

Rear Main Oil Seal

GM 3.0L 4.3L, 5.0L &, 5.7L Rev. Rotation 1Pc Seal

Item#:

15123

Cross Reference#:

FI1101302
R047175
R047175
15123
17725
8M0062772
85970

Manufacturer Item:

8M0062772

Manufacturer:

Mercury Marine

Available:

In Stock

Your Price:

51.49

Each

Qty:

Rear Main Oil Seal

GM 3.0L 4.3L, 5.0L, & 5.7L Std Rot. 1 Pc Seal w/Gasket

Item#:

BS40520

Cross Reference#:

8M0077606

Manufacturer Item:

14240

Manufacturer:

Felpro

Available:

In Stock

Your Price:

32.99

Each

Qty:

Rear Main Oil Seal

GM 3.0L 4.3L 5.0L & 5.7L Std Rotation 1Pc Seal

Item#:

18-0519

Cross Reference#:

R047173
3852657
8M0077606
9-61621
912957

Manufacturer Item:

14240

Manufacturer:

Sierra

Available:

In Stock

Your Price:

44.49

Each

Qty:

Rear Main Oil Seal

GM2.5L 3.0L 4.3L 5.0L 5.7L Std Rotation 2Pc Seal

Item#:

BS40013

Cross Reference#:

FI5110026
FI5110027
FI5110041
R047172
R047172
18-1211
49947
58203
814622
985086

Manufacturer Item:

814622

Manufacturer:

Felpro

Available:

In Stock

Your Price:

19.37

Each

Qty:

Rear Main Oil Seal

GM 7.4L Gen IV Rev. Rot 2Pc Seal 1968-1992

Item#:

17740

Manufacturer:

Felpro

Available:

In Stock

Your Price:

111.10

Each

Qty:

Rear Main Oil Seal

GM 5.0L & 5.7L V8 Rev. Rotation 2Pc Seal

Item#:

17720

Cross Reference#:

R047174
35313

Manufacturer:

Felpro

Available:

Special Order

Your Price:

94.47

Each

Qty:

Rear Main Oil Seal

GM 7.4L & 8.2L Gen V & VI 1Pc Seal Std Rot. 1992-1998

Item#:

18-1234

Cross Reference#:

3853528
7080030
811554
9-61622

Manufacturer Item:

811554

Manufacturer:

Sierra

Available:

In Stock

Your Price:

109.89

Each

Qty:

Rear Main Oil Seal

GM 7.4L Gen IV Std Rot 2Pc Seal 1969-1992

Item#:

BS40096-1

Cross Reference#:

FI1100926
FI5110040
FI5110046
FI5110048
F3962863
14756
37479
67855
75585
8M0062773

Manufacturer Item:

26-14756

Manufacturer:

Mercruiser

Available:

In Stock

Your Price:

28.19

Each

Qty:

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