Learn step-by-step how to check motorcycle oil using a dipstick or inspection window. Find out how often to inspect oil for peak engine performance.
How to check motorcycle engine oil
Whether you ride a shaft drive motorcycle or a chain-drive classic, it's essential to check your engine oil regularly. That's because every motorcycle engine needs an appropriate level of the right oil - in the right condition - in order to give you the performance, economy and reliability you deserve. Maintaining the correct oil level is easy, and choosing the right oil is just as important – explore our range of motorcycle oils to find the perfect fit for your bike.
Fortunately, checking your engine oil is an easy task on almost every motorcycle.
First park your bike on level ground - usually on a centerstand or paddock stand - and leave it for at least 20 minutes to cool down if the engine has been hot, and to allow all of the oil to drain into the sump before carrying out your check.
If your bike is reasonably modern, it will often have an inspection window, low down on one side of the engine. You may have to get close to the ground to see inside properly, and we also recommend doing this in daylight, so you can get an idea of the level and the condition of your oil.
The inspection window will have marks at the top and the bottom, and your engine oil level should be somewhere between the two. If the level is above or below these lines, you must act immediately to either drain a little oil away or to top off your oil level.
Just as importantly, you also need to assess the condition of the oil. It should be either green or yellow, as well as shiny and semi-transparent.
If your oil is dark brown or black and you can't see through it, or you can see sludge deposits, it is definitely time for an oil and filter change.
Alternatively, if you can see metal particles in the oil, this can be an early indication of engine problems ahead; while if the oil looks at all milky, it can often indicate a coolant leak. In either of these two cases, you should consult a mechanic or repair shop to rule out or deal with serious problems as soon as possible.
The rate at which your bike will use engine oil isn't a constant. Environmental factors such as poor fuel quality, extreme temperatures or just spirited riding can affect your bike's oil consumption.
Here at Castrol most of our motorcyclists check their oil level at least once a week, and always before going on a long run or a road trip.
That's because even if you stick religiously to the drain intervals and viscosity of oil recommended by the OEM, even the strongest oil won't protect your bike if the oil level gets too low.
So a weekly oil level check, and a top off whenever necessary, really is a vitally important part of looking after your motorcycle.
Maintaining the correct engine oil level is vital for your motorcycle's health and performance. Whether your bike uses a dipstick or an inspection window, regular checks are essential. Remember to check your oil weekly and before long rides, looking for the correct level and a healthy oil color and consistency. Don't let low or degraded oil compromise your engine – find the right Castrol oil for your motorcycle using our convenient Product Finder and keep your ride running smoothly.