just had an oil analysis on my 95 BMW 525I using Mobil 1 0w40, changed at 3,700 miles, 104,000 miles on the car. I was worried because the oil was getting dark very quickly.
The analysis was fine except in two areas. 23 PPM lead (considered high) and one percent of the oil was composed of fuel. I believe my engine is running a bit rich and diluting the oil causing oil shearing. The shearing then placed stress when I really punched the engine, thus wearing the main and crank bearings.
My question for the experts revolves around the fuel issue. What is causing fuel in the oil? I thought of several items. Replace the air filter (last replaced 17,000 miles ago), check fuel injectors for leaking and coils for malfunction. Both the injectors and coils are believed to be original. Oxygen sensor is another possibility. It was replaced 49,000 miles ago. Plugs have been in for 24,000 miles.
What do you think? Are there other items I should check/replace?
TIA
The analysis was fine except in two areas. 23 PPM lead (considered high) and one percent of the oil was composed of fuel. I believe my engine is running a bit rich and diluting the oil causing oil shearing. The shearing then placed stress when I really punched the engine, thus wearing the main and crank bearings.
My question for the experts revolves around the fuel issue. What is causing fuel in the oil? I thought of several items. Replace the air filter (last replaced 17,000 miles ago), check fuel injectors for leaking and coils for malfunction. Both the injectors and coils are believed to be original. Oxygen sensor is another possibility. It was replaced 49,000 miles ago. Plugs have been in for 24,000 miles.
What do you think? Are there other items I should check/replace?
TIA
