Okay, so this could be one thing causing all of the issues, or could be each one individually. I have a 91 RS with 305 and a 5 speed manual if y'all need to know. So here is the rundown: car overheats, oil pressure reads when first starting then goes to low or none when trying to drive at all, and the battery voltage meter reads lower and lower as I drive till it is as low as it can go, but car has not died as of yet, but I can't test if continued driving will make it die as it overheats and smokes out the cabin before that. I had the top radiator hose burst a bit ago, replaced it and refilled coolant. Do not see a visible oil leak by engine but the support bar next to driveshaft and around the diff there is some oil build up but I don't think it is still putting oil there but still doesn't look too old. Oil level is slightly above full when reading the dipstick. As for the battery, the alternator is definitely new, as when I bought the car the alternator is still super super shiny. I assume the battery is new, as the guy I bought it from only had it for a bit as a minor parts car, and he owns a shop and has a huge stock of batteries, and this one has one of those, also had AutoZone test it and they said it was fine. Any suggestions at all are welcome, at this point I might just wanna gut it all out, and begin an engine swap and build up from there instead of trying to repair this mess. 😰😂

 

First, is your fan running? Have you checked the the ignition timing. retarded timing will cause it to over heat. Over heating will break down the oil and hot oil thins out which will lower oil pressure. As for the charging system heat can damage that as well. But solve the over heating first. Good luck