Subaru Legacy 3.6L Spark Plugs
Catalog-listed plug, cross-brand equivalents, gap, and where to buy for the Subaru Legacy 3.6L.
Listed in a manufacturer plug catalog — confirm against your owner's manual before buying.
The Denso IKH20 is a 14mm thread, 19mm reach, gasket seat, heat range 20, iridium electrode spark plug, pre-gapped to 0.030". These specifications are decoded from the Denso part number and determine which plugs it safely cross-references to — a valid equivalent must match the thread, reach, seat and heat range.
Spark plugs that fit the Subaru Legacy 3.6L
| Plug | Metal | Gap | Buy |
|---|---|---|---|
| Denso IKH20 | Iridium | 0.030" | Buy |
| Denso VKH20 | Iridium | — | Buy |
Frequently asked questions
What spark plug does a Subaru Legacy 3.6L use?
A manufacturer catalog lists the Denso IKH20 (Iridium), gapped at 0.030". Listed in a manufacturer plug catalog — confirm against your owner's manual before buying.
How many spark plugs does a Subaru Legacy 3.6L need?
Check your owner's manual for the exact count for this engine.
What is the spark plug gap for a Subaru Legacy 3.6L?
0.030" — always confirm against the label or manual before installing.
Affiliate disclosure: As an Amazon Associate and affiliate partner we earn from qualifying purchases. Always confirm fitment against your owner's manual or the manufacturer catalog before buying.