mixing oils is a BAD idea.
People focus on VISCOSITY, but the real issue is that each brand/type of oil has their own stabilizer/chemistry package. So for one oil, you have a spectrum of oil molecules, mixed in with a stabilizer package. This works well when all the oil is the same- all the oil is stabilized by the interplay of the other molecules in the solution.
When you mix oils, you are mixing these stabilizers, and they are then no longer fully effective....
Hence, when you add different oil, you should CHANGE oil at the next chance you can. like in a few hundred miles, like when you get home, like after your trip is done....
Most non-car guys just drive their BMW between service visits, and would never think to grab a few quarts of BMW oil to carry around... But if they have to pay for an out of pocket oil change by the dealer, they may learn this trick.
And dont ask the SA at the dealer... they aren't experts by any stretch.
A
11-24-2012, 10:00 PM
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