Some questions for you...
Is it a grinding or chattering sound? Grinding implies that the starter teeth are making the noise when attempting to turn the flywheel...either worn or missing teeth.
Chattering would be more of a hard starting situation, like the battery is weak or dead. I'm guessing that if you can crank it 12-13 times in one sitting that your charging system is fine.
Your symptoms point to a bad starter, and since you've had intermittent problems for two years, I would suspect that it's just getting worse.
I don't know if the 85 190E has an OVP relay, but it causes hot starting problems. The OVP is not related to the grinding noises, so I would go after that starter first...
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