Some backstory: My sister got this van earlier this year and it had a pretty significant head gasket problem. We used a bottle of Bar's Stop Leak in the coolant and changed the oil and it seemed to stop the leak. She went around 4,500 miles on that oil change and everything continued to perform fine. No coolant loss, no oil consumption, etc. I changed the oil again and after about 2,000 miles it burned 2 quarts of oil unexpectedly. I changed the oil earlier than expected after this incident and kept a close eye on the dipstick whenever I saw the vehicle and the last time I checked it was just a week or so ago and everything looked fine. I just changed the oil about 2 or 3 weeks ago, maybe? She texted me this morning with a video of her starting the van and it was knocking like a jackhammer. I came over to check it out later in the day and looked underneath the vehicle and saw parts of the engine block and some oil on the pavement. She said it was a sudden failure, and sounded fine the last time she drove it but started making this horrible noise when she tried to start it today. I'm thinking that the head gasket finally completely failed and it might have ingested some water as white smoke was billowing out of the tail pipe while it (barely) ran and was knocking. I did notice some milky residue in the oil on the dipstick as well. It seems not all of the oil leaked out as it's still registering almost full on the dipstick, though it's possible that there's a lot of coolant in with it as well. I would've imagined seeing a larger pool of oil underneath the vehicle. Anyways, it had around 221,000 miles on it, so it had a pretty good run. The dashboard was always lit up like a Christmas tree and the tachometer got stuck on the gear indicator needle when the gauges would go haywire, sometimes the speedometer would read 100mph in park and the gas/temperature gauge would go up and down rapidly, the rear shocks were blown and the rocker panels had large enough rust holes to put your hand through. The last few times I drove it, it did run very well and the engine was quiet and smooth. It's still sorta running, but it sounds absolutely awful and will likely die completely if they run it anymore. R.I.P. Windstar!