Mark D would the EAT chip make my engine run rich and affect fuel dilution and affect lead levels? My mileage did not not really change when I satrted using your chip. Just looking for causes and to see if I even have a concern.

BTW, you have not updated the chip for my 95 525i or have you? I know that you occasionally go to a new generation chip after feedback from users.


Quote Originally Posted by Russell
Ran a Blackstone Lab oil analysis on my last two 1995 BMW 525i oil changes.
Both oil changes with Mobil 1 0W-40 Synthetic oil.
Miles on car: 104,228, 108,206
Miles on this oil: 3,635, 3,978
No make up oil added either oil change.

I am very concerned over the metals, especially iron and lead. Perhaps I should quit using Mobil 1 0w40 and use a heavier oil. I now use 5w40 Mobil 1 Truck and Suv. the 5w40 is considered an excellent oil

Any thoughts?

Change one change two
3,635 miles, 3,978 miles
TBN =6.3 TBN =5.0
Aluminum 3 3
Chromium 1 1
Iron 9 23
Copper 3 5
Lead 23 40
Tin 0 2
Molybdenum 58 68
Nickel 0 0
Manganese 0 0
Silver 0 0
Titanium 0 0
Potassium 0 0
Boron 127 149
Silicon 2 3
Sodium 4 4
Calcium 2663 2587
Magnesium 12 16
Phosphorus 622 799
Zinc 670 900
Barium 0 0

Viscosity 69.5 66.5
Flash point 355 365
Fuel 1.0% 0.5%
Antifreeze 0 0
Water 0 0
Insolubles 0.3 . 4