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Earl's Performance 503ERL Billet Aluminum Sandwich-Style Oil Thermostat

(Chevrolet Silverado 1500 1999-2006, Silverado 1500 HD 2001-03, 2005, Suburban 1500 2000-01, Camaro 1998-2002, Corvette 1998-2004 + 128 more models)

Part of: Earl's Performance Billet Aluminum Sandwich-Style Oil Thermostat

Other options in this family: Earl's Performance 502ERL

Manufacturer

Picture for manufacturer Earl's Performance

Part Number

503ERL
7 reviews
Sale Price

$199.95

In Stock (5)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Earl's Performance 503ERL is a billet aluminum sandwich-style oil thermostat designed to promote rapid oil warm-up and maintain optimal engine oil temperatures. It installs between the oil filter mounting boss and the oil filter, making it a clean, non-invasive addition to the engine's oiling system.

The integrated thermostat element keeps oil circulating within the engine during cold starts, bypassing the oil cooler until operating temperature is reached. Once oil temperature climbs, the thermostat opens progressively to route flow through the cooler, protecting engine components across a wide range of operating conditions.

Key Features:

  • Sandwich-style design mounts between the oil filter boss and oil filter — no cutting or welding required
  • Thermostat begins opening at 160°F (71.1°C) and is fully open at 180°F (82.2°C)
  • 13/16-16 in. center post thread for broad compatibility with most typical applications
  • -10 AN Female O-Ring inlet and outlet ports for leak-free, high-performance plumbing connections
  • Machined from billet aluminum for strength and durability
  • Natural (uncoated) aluminum finish
  • Sold individually

The Earl's 503ERL is compatible with Earl's Temp-A-Cure oil cooler systems and is legal for use on emissions-controlled, non-emissions-controlled, and racing-only vehicles.

Products specifications

Fits

Chevrolet Silverado 1500 1999-2006, Silverado 1500 HD 2001-03, 2005, Suburban 1500 2000-01, Camaro 1998-2002, Corvette 1998-2004, Silverado 2500 HD 2001-06, Tahoe 2000-04, 2006, Colorado 2004-06, Malibu 1997-99, Trailblazer 2002-06 + 123 more models

Brand

Earl's

Category

Engine

Center Stud Diameter

13/16-16

Emission Code

5

Finish

Natural

Fully Open

180 Degrees Farenheit

Inner O-Ring Diameter

2.887 Inches

Material

Billet Aluminum

O-Ring Cross Section

.139 Inches

Outer O-Ring Diameter

3.387 Inches

Part Type

Engine Oil Pump

Port Size

7/8-14 Female (-10 O-Ring Boss)

Product Type

Oil Cooler

Starts to open

160 Degrees Farenheit

Sub Category

Cylinder Block Components

Thickness

1.475"

Excellent price and fast shipping. Product showed up as described and timely.

First time

Thanks Autoplicity you had the best prices I could find, fast shipping, and everything I ordered was exactly what I was looking for! Great Customer Service!

Great price. Very happy with order. Will buy from them again.

absolutely lowest price on my Griffin radiator and super fast with the shipping to boot, what more could you ask for!

Quickly received item. Exactly what I ordered and was best price out there. Will do business with them again.

Great pricing and delivered in 3 days.

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