Caterpillar 1R-0739 Engine Oil Filter

Fitment and Service Notes

The 1R-0739 is the element a 320D owner will buy more often than any other: the engine oil filter comes off at every scheduled oil service, and on a machine working 10-hour shifts that means several elements a year. Cat's own 320D parts reference guide names it for the standard 320D, the 320D L and the 320D GC, which is why this page anchors on that machine — but the same spin-on element is listed across the wider Cat fleet on aftermarket fitment lists, including earlier 320-series excavators with 3116/3126/3066 engines (checked September 2026).

The one decision a buyer must not skip is the serial prefix. Cat's reference guide splits the 320D by serial prefix: the mainstream prefixes run the 1R-0739, while MZD-prefix builds list the 1R-1807 element instead. 1R-0739 is also not the same as the 1R-1808 element we stock for the 330D/336D/345D class — different engine families, different specifications. The number stamped on your old filter plus the machine serial resolves all of it, and we confirm both before anything ships.

This page is part of the Cat 320D service set on the site: the Cat 320D filter guide carries the complete list (fuel 1R-0751, separator 326-1644, air 131-8821/131-8822, return 179-9806), the 320D fuel filter page covers the fuel side, and the 320D radiator 326-3870 page covers cooling. For the broader Cat engine picture, see our Caterpillar engine parts guide and the OEM heavy equipment parts buyer's guide; for authenticity checks before you buy, read how to spot fake filters.

FAQ

Q: Which machines take the Caterpillar 1R-0739 oil filter?
A: Cat's 320D parts reference guide lists the 1R-0739 as the engine oil filter for the standard 320D, the 320D L and the 320D GC (C6.4 engine, most serial prefixes). Aftermarket fitment lists also cover earlier 320-family excavators with 3116/3126/3066 engines. MZD-prefix 320D builds list the 1R-1807 instead, so confirm with the number on your old filter and your machine serial.

Q: Is 1R-0739 the same as 1R-1808 or 1R-1807?
A: No. 1R-0739 and 1R-1807 are different elements for different 320D serial prefixes, while 1R-1808 belongs to the 3406/C7-C18 engine class and the 330D/336D/345D excavators. All are spin-on Cat lube filters with different specifications — match the number stamped on the old filter rather than substituting by eye.

Q: What aftermarket filters cross-reference to 1R-0739?
A: Aftermarket cross-reference lists pair 1R-0739 with Baldwin B7600, Fleetguard LF667 (LF3730 appears on some lists) and Donaldson P554004; older Cat numbers 1R-0658, 1W-3300 and 2P-4004 appear on the same fitment lists. Cross numbers differ slightly between suppliers — confirm the physical fit against the filter head on your machine.

Q: Is this oil filter OEM or aftermarket, and how do I order it?
A: This is a high-quality aftermarket engine oil filter cross-referenced to Caterpillar OEM 1R-0739, typically priced 30–60% below OEM list. Message us on WhatsApp or email sales@cn-machinery.com with your machine model, serial and the number on your old filter — stock items dispatch in 3–7 days, FOB Shanghai or CIF to your port.