[Joe Bob]

There are no NEW Bosch starters for SCs and Carreras. They are ALL re-manufactured/rebuilt. The cheaper the "rebuild" the bigger the profit.

If a starter's solenoid tests out when it's cold, they don't open it up to see if the solenoid has enough grease or if the grease inside is cooked or not. It's not their money that is spent removing and replacing the starter, it's yours. Hot start issues have been around for years.

If you had a multimeter you could measure the drop in voltage at the starter's solenoid.

Most reman companies will gladly exchange the starter but not labor. You asked for advice, this is mine. It's based on 38 years of screwing around with German cars....I've had this problem MANY times.

Reminiscing......

3-4 years ago, I had an issue such as this on a 58 "A"....but cold start, it ended up being a bent starter shaft. Rare but that happens. The cause was a worn bushing in the trans where shaft pushed into.....it dragged down the voltage enough to suspect the solenoid.

I was able to get the bushing out with a dental pick.....what a PITA.