Its not coolant, he said he doesnt smell coolant, that was mentioned happening on a different car....
T-stats open based on temp, if it was stuck closed the engine would overheat pretty quick, if it stays at 180 it sounds like its working OK.
Blowby is most likely caused by worn rings, if the engine is all original with unknown history theres a good chance thats the cause if everything else like PCV is working ok. Best to do a compression test, you can rent a tester from most auto part stores if you dont have one.
As for the restore additive, it wont fix shot rings but may improve the blowby a little temporarily if its related to worn rings/cylinder walls. I used it in my first car when I was 16, a 1977 firebird forumla with the factory sbc engine, had higher miles & burned oil, we did a comp test & found a few cylinders low, so I tried the restore until a basic rebuild could be done the next year... it did improve the oil burn smoke quite a bit.
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