NGKtoDenso
Direct engineering interchange matrix converting NGK OEM and aftermarket references to verified Denso replacements. Each mapping includes thread dimensions, gasket seating, and bypass relief PSI tolerances.
Verified Interchange Part Numbers
Direct manufacturer catalog matches and 2-hop verified cross-references.
| NGK Reference | Filtration Category | Denso Replacement | Tolerance & Specs |
|---|---|---|---|
| BKR6E | Standard Copper Spark Plug | K20PR-U | Compare Specs |
5-Point Inspection Protocol: NGK to Denso
Before mounting a Denso substitute onto a system originally calibrated for NGK, complete this 5-point physical clearance inspection:
Thread Pitch & Diameter
Confirm pitch type (Metric vs UN/UNF). Never force a metric M20 thread onto a 3/4-16 imperial mounting stud.
Gasket Seating OD
Measure outer gasket diameter. A discrepancy over 3 mm risks oil blowout under high operating oil pressures.
Bypass Valve Setting (PSI/Bar)
Verify relief valve opening pressure. High bypass differentials circulate unfiltered oil prematurely.
Anti-Drainback Valve
Required if the filter canister is mounted horizontally or inverted to prevent dry starts.
Canister Clearance Height
Ensure adequate clearance from vehicle frame rails, steering linkages, or exhaust manifolds.
Frequently Asked Questions: NGK → Denso
Are NGK and Denso filters directly interchangeable?
Yes, NGK parts listed in this cross-reference matrix share identical thread dimensions and operational tolerances with their corresponding Denso replacement numbers. Always verify physical gasket diameter and bypass relief valve pressure prior to installation.
How do I verify the thread size when converting from NGK to Denso?
Spin-on filters must share identical thread pitch (such as 3/4-16 UNF, M20x1.5, or 1-14 UNS). Check the detailed spec teardown on the filter page to ensure your engine mounting nipple matches the replacement canister.
Does replacing a NGK filter with Denso void machinery warranty?
Under the US Magnuson-Moss Warranty Act and European block exemption regulations, using a certified OEM-spec aftermarket filter such as Denso that meets or exceeds OEM performance standards does not void vehicle or equipment warranties.
What if the bypass valve PSI differs between NGK and Denso?
Minor bypass pressure variances of +/- 2 PSI are within normal manufacturing tolerances. If the difference exceeds 5 PSI, verify your engine oil pump pressure profile to prevent premature oil bypass during cold starts.
Search Other NGK or Denso Parts
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