I'm not sure if I understand... if so, then try this:
Run a (big) bottle of techron through the fuel system only when you have 3 or so gallons of gas left... then run it real low. Upon fill-up, use one more big bottle of techron... and when finished with that tank of gas, get an oil change.
It might just take a second application through the system.
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)