Checking your engine oil is a crucial part of motorcycle maintenance, ensuring your engine is properly lubricated for optimal performance and longevity. For owners of classic BMW R series motorcycles like the R1100 and R1150, there’s a unique aspect to the Oil Check procedure that might not be immediately obvious: the sidestand method. This isn’t just some quirky habit; it’s rooted in the engine design of these iconic bikes.
The reason behind the sidestand oil check for these BMW models comes down to oil displacement within the engine when parked upright. Specifically, when these engines are in a vertical position, some oil can become trapped away from the sump. This trapped oil leads to a falsely low reading if you were to check the oil level immediately after parking the bike upright. Leaning the motorcycle on its sidestand for a few minutes allows this trapped oil to drain back into the sump, providing a more accurate oil level reading when you finally perform your oil check. This sidestand pause ensures you’re seeing the true oil quantity available for your engine.
Interestingly, BMW’s official recommendation to check oil only on a fully warmed-up engine adds another layer of complexity, and frankly, impracticality, especially for a quick pre-ride inspection. While it’s true that oil expands slightly when hot, leading to a marginally higher reading compared to a cold check, this difference is often less significant than the range between the minimum and maximum oil level marks. Waiting for the engine to fully warm up just to check the oil makes it less likely that riders will incorporate this vital check into their regular pre-ride routine.
Many experienced riders, and common sense, dictate that a cold oil check is perfectly acceptable, especially as a quick pre-ride safety measure. You might observe a slightly lower level in the sight glass when cold, perhaps around 1/8″ lower than when hot. However, as long as the level is within the acceptable range indicated in your owner’s manual, whether checked cold or after a sidestand drain, you can be confident in your engine’s oil status.
It’s worth noting that BMW’s seemingly overly cautious advice might stem from concerns beyond just accurate readings. Past legal issues, such as lawsuits related to motorcycle fires when idling, may influence their recommendations towards procedures that minimize any perceived risk, even if it complicates routine maintenance like a simple oil check. Understanding the nuances of oil checks, especially the sidestand method for certain BMW models, empowers riders to maintain their bikes effectively and confidently, ensuring many more miles of enjoyable riding.
