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5% Fuel in the Engine Oil - from oil analysis
I sent in an oil sample for the first time. It had been 6,000 miles since the oil change at the dealer. It was Motorcraft 15W-40. My first oil change since purchasing this truck used from a Ford dealer. Well, I got a call from the oil analysis lab, and obviously, he didn't have a lot of good news.
First off, he said I had 5.5% fuel dilution in the motor oil. I told him that I idled the engine a lot, and he acted like 2% fuel dilution is common for 6.0L Powerstrokes, but not 5.5. And while Ford claims that up to 8% dilution is okay (According to the lab) but he finds that 8% is obviously very bad news.
So did I do this idling the engine a lot? He says that this amount of fuel brings the oil down to around 10W-30. Do I have a bad injector?
The other thing is there was some silicon, but when he asked me if I used silicone sealant for the oil filter, I had no clue (I have never changed it). He acted like I should check the air filter, too, but it was new 6,000 miles ago, I believe.
He said the wear looks good, but maybe the fuel diluted signs of engine wear!