10/22/2026
0W-20, 5W-30, 5W-40, 10W-40… What’s actually in your engine? 🛢️🔧
Few topics spark more debate among enthusiasts than engine oil. Everyone has their preference, but how much do you really know about what those numbers mean?
We put together this breakdown to explain oil viscosity, how it changes with temperature, what happens inside your engine, and why choosing the right oil matters.
👉 Swipe through. You might learn something new.
Now we’re curious what the bootmod3 community is running!
🏎️ What BMW engine do you have?
🛢️ What oil brand and viscosity are you running?
🔥 Stock or tuned? How much power are you making?
Have you changed oil grades since tuning, or stuck with the factory recommendation? Let us know below! 👇