SALEM – A Lynn auto mechanic whose luck ran out when he was caught with more than two and a half ounces of heroin in his Washington Street apartment last year received five to six years in state prison.Troy A. Bettencourt, 43, of 204 Washington St., #206, Lynn, pleaded guilty Friday during a hearing in Salem Superior Court to a charge of trafficking over 14 grams of heroin before Judge David A. Lowy.The judge agreed to adopt the joint proposed recommendation offered by Assistant District Attorney Karen Hopwood and public defender David Grimaldi.Hopwood said she was prepared to show at trial that following an investigation in which controlled buys were consummated using a confidential witness, police armed with a search warrant raided his Washington Street apartment just before 10 a.m. on Dec. 4.Bettencourt was found by authorities in the master bedroom.”I knew this day would come because I have been getting away with this for so long,” Bettencourt told police.Hopwood stated that Bettencourt also told police he would buy 100 grams of heroin from a source in Lynn for $5,000, break it up and sell it.Police said they found in excess of 77 grams of heroin during a search of his apartment, along with more than $4,000 in cash, a sifter and three scales.Grimaldi told Lowy that his client “has learned his lesson and he fully expects you will not see him in Superior Court again.”The judge credited Bettencourt the five days he spent in jail in lieu of bail on the case.Bettencourt will have to serve the full five years in prison before he is eligible for parole.He was indicted by an Essex County grand jury last April.