Posts Tagged: oil emulsion

What is the yellow sludge under your oil cap?

Why Yellow Sludge in the Oil Cap Appears in Winter Quick Summary (Read This First): Finding yellow sludge or gunk in the oil cap can be alarming, but in most cases, it’s normal and not a sign of a blown head gasket. What you’re seeing is oil mist and moisture forming an emulsion due to condensation, especially in cold weather and short-trip driving. The dipstick—not the oil cap—is the real truth teller. If the dipstick oil looks normal, you’re almost certainly not dealing with a head gasket leak. Article The … Read More