. ▁ ▁First ▁generation ▁( U 1 0 / B 1 0 ) ▁▁ ▁The ▁Co aster ▁was ▁introduced ▁in ▁February ▁ 1 9 6 9 ▁in ▁ 2 2 ▁and ▁ 2 6 - se at ▁models ▁using ▁the ▁D yna ' s ▁U ▁platform . ▁It ▁had ▁the ▁▁ 5 R ▁pet rol ▁engine ▁and ▁the ▁▁ 2 J ▁dies el ▁engine ▁and ▁was ▁sold ▁with ▁the ▁model ▁code ▁of ▁R U 1 8 ▁and ▁J U 1 8 . ▁All ▁models ▁had ▁a ▁ 4 - speed ▁manual ▁g ear box ▁with ▁column ▁shift . ▁Air ▁condition ing ▁was ▁available ▁as ▁an ▁option ▁on ▁the ▁del ux e ▁models . ▁ ▁In ▁February ▁ 1 9 7 2 , ▁the ▁ 2 J ▁engine ▁was ▁replaced ▁by ▁the ▁ ▁dies el ▁B ▁engine , ▁which ▁was ▁only ▁available ▁with ▁a ▁ 5 - speed ▁manual ▁g ear box ▁with ▁column ▁shift . ▁The ▁updated ▁models ▁were ▁sold ▁with ▁the ▁model ▁codes ▁of ▁R U 1 9 ▁and ▁B U 1 9 . ▁ ▁In ▁August ▁ 1 9 7 7 , ▁the ▁Co aster ' s ▁model ▁platform ▁code ▁was ▁changed ▁to ▁the ▁B ▁series , ▁although ▁the ▁vehicle ▁itself ▁was ▁mostly ▁un changed . ▁The ▁R B 1 0 ▁had ▁the ▁same ▁ 5 R ▁pet rol ▁engine ▁as ▁before ▁but ▁R B 1 1 ▁a ▁▁ 2 0 R ▁pet rol ▁engine ▁was ▁introduced . ▁The ▁B ▁dies el ▁engine ▁was ▁dropped ▁and ▁the ▁▁ 2 B ▁dies