Parts for your 2005 Honda Odyssey-Oil cap

2005 Honda Odyssey Oil Cap — What It Does and How To Look After It

Technical sources for this model — the 2005 Honda Odyssey Owner’s Manual, the Honda workshop manual for the J35 V6, and genuine Honda parts catalogues — all specify a threaded engine oil filler cap on the rocker cover under the bonnet. So yes, an oil cap is absolutely used on the 2005 Honda Odyssey, and it’s an essential bit of kit.

The oil cap’s first job is sealing the filler neck so engine oil stays clean and where it should be. It helps keep dust, grit, and moisture out of the crankcase, and it prevents oil mist from escaping while the V6 is spinning away. It also supports correct crankcase ventilation by keeping the system sealed, which helps the PCV setup do its thing. On many originals, the cap reminds owners of the specified oil grade (commonly 5W-20 per the handbook for this year)