Parts for your 2014 Bmw X3-Oil cap

2014 BMW X3 oil cap — what it does, where it lives, and when to replace it

Based on technical references including the 2014 BMW X3 (F25) owner’s handbook, BMW Technical Information System (TIS), and the BMW electronic parts catalogue (EPC/RealOEM diagrams for the N20/N55 petrol and N47/N57 diesel engines), the 2014 BMW X3 is absolutely fitted with an engine oil filler cap. The catalogues list a dedicated oil filler cap with an integrated seal for these engines, and the handbook calls out the oil filler neck and cap beneath the bonnet. So yes—an oil cap is relevant and used on every 2014 BMW X3 variant.

The oil cap’s job is simple but crucial. It seals the oil filler neck on the cam/rocker cover, keeping the engine oil clean and the crankcase ventilation system happy. A good cap prevents dust and moisture from sneaking in, helps maintain the right crankcase pressure, and stops oil mist from weeping out. It’s also the place owners top up their oil between services—look for the oil-can symbol on the cap sitting proudly on top of the engine under the bonnet.

During regular servicing of a 2014 BMW X3, the oil cap deserves a quick once-over. The rubber seal in the cap can harden over time, leading to slight leaks, oily residue around the cap, or a faint oil smell after a drive. If the seal is perished, cracked, or flattened, it’s smart to replace the cap (or the seal if serviceable) with a quality OEM-spec part. Always clean the area around the cap before removing it so grime doesn’t fall into the filler neck, and refit the cap hand-tight—snug, not gorilla tight.

Handy signs the cap may need replacing:

• Oil film or dampness around the cap
• Hardened, cracked, or misshapen seal
• Whistling, rough idle, or slight vacuum leak symptoms after recent service
• Cap no longer seats or clicks firmly into place

Many 2014 X3s use a common BMW oil filler cap part number (often referenced as 11 12 8 655 331 on N20/N47 engines), but the safest bet is to match by VIN to ensure the correct fit. With every oil change—or every 10,000–15,000 km—have the cap checked, wiped clean, and replaced if it’s seen better days. It’s a cheap bit that protects a very expensive engine.

Popular questions

Where is the oil cap on a 2014 BMW X3?
It sits on the top of the engine’s valve cover under the bonnet, marked with an oil-can icon. On right-hand-drive X3s, you’ll typically find it towards the front or slightly to the passenger side depending on engine type (petrol or diesel). It twists off by hand.

What’s the correct oil cap part number for my 2014 X3?
Many 2014 X3 models with N20 petrol or N47 diesel engines use an OEM cap often listed as 11 12 8 655 331, which includes an integrated seal. Because BMW ran multiple engines in the F25, it’s best to confirm by VIN with a parts catalogue to guarantee the exact match.

How often should the oil cap be replaced?
There’s no set interval, replace it when the seal hardens, the cap no longer seats firmly, or you see oil mist around the filler neck. As a rule of thumb, inspect the cap and seal at each oil service and swap it out at the first sign of leakage or damage.