I have never used Mobil ! motor oil in my SLK32 AMG. It may have been good back in 2001 but there are many good synthetics available now that are superior to Mobil 1. I use penzoil in the silver container made from natural gas, have for 2 years with no issues. Currently my power steering pump is leaking. I am using Barrs leak guaranteed for ALL makes even the pesky Honda. Once I tighten the top 4 torx screws on the top of the pump itself I am quite confident the leak will stop with the barrs red synthetic stop leak. Worse case is I have the pump replaced as the shop suggested but barrs guarantees success.