Fuel Testing Update and a New Concern
Here is an update on the BP, Meijer and Mobil diesel samples I submitted for analytic testing. The fuel engineer received the samples, but unfortunately one of the bottles had leaked, so we will only receive results on two of the products.
To my disappointment, he stated that these samples had the visual appearance of biodiesel, even though the fuel was supposed to be non-bio. The lab testing is needed to determine this definitively and will be conducted after the holiday.
Based on his comment, I am feeling very concerned. My car now has roughly 9,300 miles, and I check the oil level at every fill-up. The oil level has always been constantly at the top of the "normal" range, never going beyond. However, as a layperson, I feel that the viscosity appears to have become thinner over time.
So here is my question. If I have been using mislabeled biodiesel, and the fuel has diluted the oil, would the oil level rise ABOVE the normal range on the dipstick? Or could it stay within the normal range and still be diluted, with excess oil in the crankcase not registering on the dipstick?