Honda GX340 oil type and capacity and spark plug
GarageDex's data from Honda's own published specs: the Honda GX340 takes 10W-30 oil (1.1 L (1.2 US qt)) and an NGK BPR6ES spark plug gapped 0.028-0.031 in (0.70-0.80 mm).
Shop 10W-30 oil The spec in the Honda GX340 manual
Key takeaways
- Oil capacity: 1.1 L (1.2 US qt). Add it in stages and stop at the dipstick's full mark rather than pouring the whole amount at once.
- Spark plug: NGK BPR6ES, gap 0.028-0.031 in (0.70-0.80 mm).
- Every value on this page is quoted from Honda's own manual or spec page, linked beside it.
| Item | Spec | From the manual |
|---|---|---|
| Engine oil | SAE 10W-30API SJ or later, for general use | “SAE 10W-30, API SJ or later, for general use.” source |
| Oil capacity | 1.1 L (1.2 US qt)Engine oil capacity column of the GX240-GX390 table | “1.1 (1.2 US qt , 1.0 Imp qt)” source |
| Spark plug | NGK BPR6ES | “W20EPR-U (DENSO) BPR6ES (NGK)” source |
| Spark plug gap | 0.028-0.031 in (0.70-0.80 mm) | “0.70 0.80 mm (0.028 0.031 in)” source |
| Fuel | unleaded, pump octane 86 or higher (research octane 91 or higher) | “Pump octane rating 86 or higher Research octane rating 91 or higher” source |
Parts for the Honda GX340
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Other Honda small engines
Source: Honda GX240 / GX270 / GX340 / GX390 Owner's Manual (PDF). If your unit's own manual or label differs, follow it.