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Ok, brain dump time - If the crank seal wasn't leaking before the work was done then something has happened to it as just fitting a flywheel wouldn't disturb the crank seal - it it is that leaking of course! given the scope of work and the empty sump it seems likely although if all the oil has drained then maybe a sump/sump plug issue. The crank is at the bottom of the engine but the sump is below, to loose all the oil - did the do an oil change?? was the sump bolt done up, has the sump been off???
TBH if i had the flywheel off i would have changed the crank seal as a matter of course on an older/higher miles car just to err on the side of caution. If it was changed during the work then the fault and cost to fix lies with the garage - that is if they admit to liability...
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