I was just curious if anyone has ever had this and thoughts on what remedies or trouble shooting might be. Last week when I pulled the dipstick the morning after driving to my parents place (3hr drive) I noticed a very small dab of something (2mm in dia. ) at the tip of the dipstick when I put it between my fingers it melted. I have been losing some coolant but I attributed it to an old radiator leak. Could it be something besides coolant? I haven’t noticed it since because I have been plugging in the block heater since then, which is what I usually do. 96 12v auto 253k no major engine work to my knowledge, I purchased at 140k.