How to Install a GReddy OX-04 Oil Filter
Changing your own oil? Respect. The GReddy OX-04 (GRE13901104) oil filter install is simple, but only if you’re working with the right part. Before you even grab a wrench, let’s make sure this little can actually belongs on your engine.
Spoiler: if you don’t feel like dealing with drain plugs and funnels, we’ll do it for you:
Step 1: Fitment Check (Don’t Skip This)
The GReddy OX-04 is built with:
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Thread size: M20 x 1.5
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Outer diameter: ~68 mm (2.68 in)
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Height: ~65 mm (2.56 in)
You’ll typically see this filter on Japanese performance cars (Nissan SR20, KA24, RB engines, Mitsubishi Evo, etc.), or on setups running GReddy oil coolers and relocation kits that use the M20 x 1.5 thread.
👉 If your car takes a different thread pitch (like M18 or 3/4-16), this filter won’t seal. Double-check your block, adapter, or kit specs before you spin it on.
Step 2: Gather What You Need
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Fresh engine oil (check your manual for the right weight/capacity)
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Oil filter wrench
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Drain pan
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Funnel
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Rags/shop towels
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Jack + jack stands (safety over sketchy bricks, always)
Step 3: Prep the Car
Run the engine for 3–5 minutes so the oil thins out. Then shut it off and wait about 20 minutes—warm enough to drain, cool enough not to scorch you. Get the car on jack stands and lock that parking brake.
Step 4: Drain the Old Oil
Pan under the plug, crack it loose, and let it flow. Replace the crush washer if your car calls for one. Snug the plug back in—tight, but don’t go gorilla on it.
Step 5: Swap the Filter
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Spin off the old filter (counter-clockwise).
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Make sure the old gasket comes with it.
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Lightly oil the gasket on your new GReddy OX-04.
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Thread it on by hand until the gasket seats.
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Tighten another ½–¾ turn by hand. Done.
Step 6: Add Fresh Oil
Funnel in new oil, just under the full capacity. Start the engine, idle for a minute, and check for leaks around the filter and drain plug. Shut it down, recheck your dipstick, and top off if needed.
Wrap-Up
That’s it—new GReddy OX-04 filter installed, fresh oil in, car ready for another round. Easy, right? If it still sounds like too much hassle (or your driveway already looks like a crime scene from the last DIY attempt), let us take care of it:
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