I got my money back from O'Reilly's for that Ultima starter.

I took a long drive up in the hills and got the engine nice and hot after installing the spare starter I have that occasionally hangs up on the flywheel. After parking the car and waiting a minute, I turned the key and it fired right up. I'd like to put a new solenoid on the other starter that was failing when hot. Can anyone recommend a brand? Are there other parts of the starter that fail after getting heat soaked?

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'81 300SD