So my engine started overheating I noticed my radiator blew and I replaced that the thermostat and the fan clutch. It did fine for a bit then my battery decided to take a shit, replaced that along with new spark plugs and ignition coils because it also started misfiring. It was running good for a couple weeks then the misfiring came back. For reference my engine has 291,000 miles. Checked the spark plugs and cylinders 2 and 5 had oil on them.(those were the two that were misfiring before) I don’t have the time or know how to replace the head gaskets so I’m dropping it off at a shop. The truck stopped starting on its own having to be jumped is this an alternator issue or starter? And I’m just gonna have the engine rebuilt, mechanic says he’s gonna have the block and heads resurfaced. I’m dropping it off tomorrow because I have to leave town for 2 months for work. Should my engine be good for a lot longer after that and is there a possibility of the block being cracked? I’m pretty worried about it


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Is your engine blown or are the head gaskets bad?

You mentioned oil on the plugs. Is that coming from bad valve cover gaskets, bad valves or from the bottom end itself like bad piston rings?

These engines typically last well past 300k assuming there's no issues. Oil on the plugs would be an issue though, did you really mean coolant? Usually bad head gaskets mean coolant gets where it shouldn't be like inside the cylinders or in the oil, because it's under pressure when heated up.

As for the not starting, there's not enough info in your post to figure that out.

Does it spin over but not fire? Does it not spin over? If not does the lights dim or go out when trying to start? Does it start with a jump? What's the voltage of the battery with it running and not running? Is the dash battery light on?