Vehicle Fitment – GReddy OX-03
GReddy officially identifies Toyota 4AG, Toyota 3SG, and Nissan RB engine families, along with compatible 3/4-16 UNF GReddy oil cooler blocks.
The following are useful year/make/model application candidates for a Pro Street Online fitment database. Exact filter compatibility must be checked before publishing them as guaranteed direct-fit applications.
| Years | Make | Model | Engine |
|---|---|---|---|
| 1985–1987 | Toyota | Corolla GT-S AE86 | 1.6L 4A-GE |
| 1985–1989 | Toyota | MR2 AW11 | 1.6L 4A-GE |
| 1988–1989 | Toyota | MR2 Supercharged | 1.6L 4A-GZE |
| 1986–1989 | Toyota | Celica GT-S | 2.0L 3S-GE |
| 1988–1993 | Toyota | Celica All-Trac | 2.0L 3S-GTE |
| 1991–1995 | Toyota | MR2 Turbo SW20 | 2.0L 3S-GTE |
| 1989–1994 | Nissan | Skyline R32 | Selected RB20/RB25/RB26 engines |
| 1993–1998 | Nissan | Skyline R33 | Selected RB25/RB26 engines |
| 1998–2002 | Nissan | Skyline R34 | Selected RB25/RB26 engines |
| 1989–2002 | Nissan | Laurel / Cefiro | Selected RB engines |
Fitment note: Nissan Skyline, Laurel, and Cefiro applications are Japanese-market engine-family candidates rather than a verified U.S. year/make/model interchange list. Engine swaps, oil cooler blocks, and filter relocation kits can change the required filter.
Why Double-Pleated Oil Filtration Matters
Every engine generates contaminants during operation.
Small metallic particles, carbon deposits, and other debris can circulate through the lubrication system.
A properly functioning oil filter helps remove these particles before they contribute to unnecessary component wear.
The GReddy OX-03 uses double-pleated filtration media to increase the available filtering surface area within the filter.
This design is intended to support contaminant collection while providing an appropriate oil flow path for compatible applications.
GReddy does not publish a verified filtration efficiency percentage or micron rating for the OX-03 in its standard product listing, so those figures should not be assumed.
A Practical Oil Filter for Toyota 4A-GE and 3S-GTE Engines
Toyota’s 4A-GE and 3S-GTE engines are two of the most recognizable Japanese performance powerplants.
The naturally aspirated 4A-GE became famous for its responsive character and high-revving design, while the turbocharged 3S-GTE powered performance versions of the Celica and MR2.
Both benefit from proper lubrication and routine oil maintenance.
The GReddy OX-03 provides a performance-oriented filter option for compatible applications using its 3/4-16 UNF mounting configuration.
For additional maintenance guidance, read our Is Synthetic Oil Better? What Your Engine Needs article, which explains how oil formulation, viscosity, and engine operating conditions affect lubrication performance.
A quality oil filter complements the correct motor oil but does not replace regular maintenance.
GReddy OX-03 for Nissan RB Engines
The Nissan RB engine family is a cornerstone of Japanese turbocharged performance.
From the RB20DET and RB25DET to the legendary RB26DETT, these engines remain popular for Skyline restorations, engine swaps, drifting, and motorsports.
GReddy lists Nissan RB engines among its OX-03 applications.
For RB owners, filter selection is especially important when aftermarket oil cooler blocks or remote filter relocation systems have been installed.
Confirm the mounting thread and gasket dimensions rather than selecting a filter based on engine designation alone.
Compatible With GReddy Oil Cooler and Relocation Systems
The GReddy OX-03 is also designed for compatible GReddy oil cooler and remote filter blocks using a 3/4-16 UNF filter mounting stud.
One relevant example is the GReddy 12401114 Type-I Remote Oil Filter Block, which uses a 3/4-16 UNF filter mounting thread.
When selecting an oil filter for a remote mounting system, the filter must match the remote block’s mounting specifications, not necessarily the engine’s original filter thread.
For enthusiasts planning oil cooling upgrades, our Complete Street Turbo Build Guide explains how oil cooling, engine lubrication, and turbocharger reliability work together.
GReddy OX-03 vs. OX-01 vs. OX-04
| Model | Part number | Thread | Typical applications |
|---|---|---|---|
| OX-01 | 13901101 | 3/4-16 UNF | Toyota 4AG/3SG, Nissan red-top SR |
| OX-03 | 13901103 | 3/4-16 UNF | Toyota 4AG/3SG, Nissan RB |
| OX-04 | 13901104 | M20×1.5 | Subaru FA20/EJ, Nissan VQ, selected Honda/Mazda |
The OX-03 uses a taller configuration than the OX-01, so available clearance should be checked before installation.
The OX-04 uses a different thread and should not be substituted simply because the filters look similar.
Installation and Maintenance Tips
Before installation, verify the filter thread, sealing surface, and engine-specific requirements.
Remove the existing filter and make sure its old gasket has not remained attached to the mounting surface.
Inspect the new GReddy filter and lubricate its sealing gasket with clean engine oil where required by the installation instructions.
Install the filter by hand and tighten according to the manufacturer’s directions.
Refill the engine with the correct oil grade and quantity, start the engine, and inspect for leaks.
Confirm that oil pressure develops normally. If oil pressure is absent or a significant leak appears, shut the engine down immediately.
After servicing, recheck the oil level and inspect the filter sealing area.
Frequently Asked Questions
What vehicles use the GReddy OX-03?
GReddy lists Toyota 4AG, Toyota 3SG, and Nissan RB engine families, plus compatible 3/4-16 UNF GReddy oil cooler blocks.
Does it fit a Toyota AE86 Corolla?
The 4A-GE engine family is listed by GReddy, but the specific filter mounting configuration should be verified.
Does it fit a Toyota MR2 Turbo?
The 3S-GTE engine family is listed, making compatible MR2 Turbo applications candidates for this filter.
Does it fit a Nissan Skyline RB26DETT?
GReddy lists Nissan RB engines. Verify the filter mounting arrangement, especially if the vehicle has an aftermarket oil cooler or relocation kit.
What is the correct thread size?
3/4-16 UNF, not 3/4-17 UNF.
Is the filter 84mm or 90mm tall?
GReddy’s U.S. listing specifies 84mm. GReddy UK and several Japanese-market listings specify 90mm. Confirm the supplied filter’s actual dimensions where clearance is critical.
Does the OX-03 have a magnetic filter element?
The supplied description advertises an internal magnet, but GReddy’s current U.S. product page does not confirm that feature. Magnetic filtration should not be advertised as verified without additional manufacturer documentation.
Will the GReddy OX-03 increase horsepower?
No. It is an engine maintenance and filtration component, not a direct horsepower upgrade.
Protect Your Toyota or Nissan Performance Engine With GReddy
The GReddy 13901103 OX-03 Sports Oil Filter combines double-pleated filtration technology with a 3/4-16 UNF spin-on configuration designed for compatible Japanese performance engines.
From Toyota’s 4A-GE and 3S-GTE to Nissan’s legendary RB family, the OX-03 provides a genuine GReddy oil filtration option for properly matched applications.
Choose the GReddy OX-03 when your engine or remote oil filter block requires its specific thread, sealing dimensions, and filter configuration.
There are no reviews yet.