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Fun Fact: In the movies they had to dub Scotty's voice as he became more Scottish (and belligerent) in his old age.
(startrek.website)
Wae da Captain expect a miracle buh ma union sez ya git a break. Tha mi a' dol ga dhèanamh. Pog mo Thoin!
James Doohan was Canadian though, if anything I'd expect him to get more Canuck and polite as he got older.
"Sorey aboot that, Captain, but she's all ootta juice. What say we pull in fer some hydro to top off the dilithium and grab a twelver of Molson and a box of Timbits, eh?"
Captain... how're you now?