what is the size of the wrench to use for this item?

You do not need a wrench. You can install hand tight. Turn till firm tight then if you can tighten no more than 1/4 turn. Use a rag or adjustable oil filter wrench.

What is the mircon rating?

see the graph in below link. depends on the efficiency. example aprox. at 20% about 4 microns, 80% at 14 microns, 99% at 24 micros etc https://www.stowerscat.com/p/74/Advanced%20Efficiency%20Engine%20Oil%20Filters.pdf

Will this filter work on my 04 duramax

Yes order a kit from mark decola diesel performance on instagram it’s 70 bucks but comes with with the adapter and the filter I run it on my lbz duramax

Can you use synthetic Oil with this filter?

oil is oil, it will filter it, the microns is what you look for in a high end filter

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Caterpillar 1R-1807 Advanced High Efficiency Oil Filter (Pack of 1)

Caterpillar 1R-1807 Advanced High Efficiency Oil Filter (Pack of 1)

Product ID: 25041157

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Details

Brand
Caterpillar
Product Grade
Performance
Vehicle Service Type
Loader
Item dimensions L x W x H
4.25 x 4.25 x
Thread Size
1.125-16 UNF

📏262mm height for optimal fit

⚙️1.125-inch UNF thread precision

🛠️108mm diameter engineered for performance

Description

🛢️ Power your machine with precision—don’t let subpar filters slow you down!

OPTIMIZED DIMENSIONS - 262mm height and 108mm diameter designed for perfect compatibility with your loader.
PRECISION THREAD FIT - 1.125-16 UNF threading ensures seamless installation and leak-free operation.
PERFORMANCE GRADE PART - Built to meet OEM standards, delivering superior filtration and engine protection.
SINGLE PACK CONVENIENCE - One high-efficiency oil filter per pack—ready to upgrade your machine’s performance.
GENUINE CATERPILLAR QUALITY - Trust the authentic 1R-1807 for unmatched reliability and durability.

The Caterpillar 1R-1807 Advanced High Efficiency Oil Filter is a genuine OEM performance part designed specifically for loaders. Featuring a 1.125-16 UNF thread size, 262mm height, and 108mm diameter, it guarantees a perfect fit and superior filtration to protect your engine. This single-pack filter ensures reliable, high-efficiency oil filtration, maintaining your equipment’s peak performance and longevity.

Specifications

Brand	Caterpillar
Product Grade	Performance Part
Vehicle Service Type	Loader
Item dimensions L x W x H	4.25 x 4.25 x 10.31 inches
Thread Size	1.125-16 UNF
Item Weight	2.1 Pounds
OEM Part Number	1R-1807
Manufacturer	Caterpillar
Number of Items	1
Automotive Fit Type	Vehicle Specific Fit
UPC	760999041902
Model	1R-1807-1Pack
Item Weight	2.1 pounds
Product Dimensions	4.25 x 4.25 x 10.31 inches
Item model number	1R-1807
Is Discontinued By Manufacturer	No
Manufacturer Part Number	1R-1807

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