Step-By-Step: How to Use a Three Leg Oil Filter Wrench Safely

Step-By-Step: How to Use a Three Leg Oil Filter Wrench Safely

Step-By-Step: How to Use a Three Leg Oil Filter Wrench Safely

By DNT Tools · Ningbo Dongning — we focus on quality tools that are reliable and safe. Using a three-leg (claw / 3-jaw) oil filter wrench correctly ensures you remove filters without damage. About Us

Understanding the Three Leg / Claw Type Wrench

According to Wikipedia’s oil-filter wrench page, the claw (3-jaw) style uses three geared prongs. As you turn anticlockwise, the prongs clamp more tightly into the filter body, improving grip even when filters are stuck.In a demonstration of the 3-leg wrench model OFW58110, it shows how the jaws tighten as torque is applied, supporting filters from 58 mm to 110 mm. 


Why Use It & What to Watch Out For

  • **Advantage:** It self-tightens as torque increases, giving strong grip even on stuck filters.
  • **Benefit:** The OFW58110 version works with a low profile in tight spots (58–110 mm range).
  • **Risk:** Prongs may scratch or deform thin filter housings if overtightened or misaligned.
  • **Constraint:** In very cramped engine bays, inserting the claw legs evenly can be difficult.
  • **Surface matters:** Too much oil or a slick surface may cause slippage before prongs bite properly.

Step-By-Step: Safe Operation Guide

  1. Prepare & Clean: Let the engine cool. Clean the exterior of the filter to remove grease and debris so prongs can grip well.
  2. Position the Wrench: Align all three prongs evenly around the filter. If using an adjustable model, pre-set approximate diameter before tightening.
  3. Initial Bite / Loosening: Turn slowly anticlockwise. The prongs should dig in and start rotation gradually.
  4. Remove the Filter: Continue steady torque until the filter is fully loosened. Be ready for it to spin or drop once freed.
  5. Post-Removal Check: Inspect the filter housing for prong marks. Clean mounting surface and remove gasket residue.
  6. Tool Care: Clean prongs and pivots, check for wear, store dry to prevent corrosion. Replace worn legs if necessary.

Practical Tips & Best Practice

  • Apply torque gradually — sudden high force risks slipping or filter damage.
  • Use extensions or universal joints carefully — avoid side loads on the claw tool.
  • If filter is extremely stuck, use penetrating oil or tap lightly to break seal before applying claw force.
  • Never use the claw wrench to tighten new filters — torque new filters by hand or per spec.
  • Ensure prongs maintain even contact; misaligned legs reduce grip efficiency.

At DNT Tools, we design three leg (claw) filter wrenches with optimized prong geometry, durable materials, and customizable ranges to reduce slippage and minimize damage to filter housings. If you need a custom version for odd sized filters or tight engine bays, feel free to contact us.