Second-half goals from Louis Barnes and Danny Fearnehough sparked a battling Vauxhall comeback but it wasn’t enough on a wet Saturday in Lincolnshire.
Motors had their chances in the first period but went in a half-time 2-0 down. A cross by Ian Ross was nodded down and Marc Newsham volleyed home from eight yards after 12 minutes.
Lloyd Ellams volleyed narrowly wide and a goalmouth scramble was eventually cleared by the Boston defence but the Pilgrims doubled their lead just before the break. A corner by Ross was swung in and Scott Garner got his head to it first.
But worse was to follow as seven minutes into the second half, Boston made it 3-0. Ross again was the provider as his free-kick was played into the box and the ball fell to Newsham who smashed it into the bottom corner of the net.
But Vauxhall were far from down and out. Two minutes later Shaun Tuck was brought down just outside of the penalty area and Louis Barnes stepped up to smash the free-kick past Lewis King in the Boston goal.
Barnes then tested King again before the fightback gathered on 63 minutes. Steve Wainwrigh sent over an inch-perfect cross from the right which Danny Fearnehough headed home.
An equaliser was looking likely, and substitute Tom Rutter almost got it as he raced onto a through ball but fired a shot narrowly wide.
But Boston killed off the comeback on the break. A 74th minute counter attack saw the ball played in to Ricky Miller who raced through on goal and sent a delightful chip over Jones.
Three minutes later the hosts grabbed a fifth from the penalty spot after Miller was brought down by Andy Nicholas. Ross slotted the ball past Jones from 12 yards to finish the scoring.
Vauxhall: Jones, Wainwright, Barnes, Hannigan, Nicholas, Clair, Fearnehough, Williams, Tuck (Hughes, 84), Ellams. Noone (Rutter, 59). Subs not used: Davies, Gary Martindale, Mendes.
Motors lost to Colwyn Bay for the second time in five days when the Welsh side won 3-0 on a rain-hit New Year’s Day afternoon at Rivacre Park.
Their day got off to a bad start just before the half-hour mark as Danny Fearnehough limped off with a leg injury and then got worse as Bay took the lead.
Marc Williams' first shot was blocked by Andy Nicholas but the former Chester FC turned in his second attempt.
Vauxhall reacted well to going and created several chances before the break. Stephen Tames shot wide twice, and substitute Owen Davies tested the Bay goalkeeper from long range.
Lloyd Ellams pulled a shot wide at the start of the second half but that was Motors' only notable chance in the second half as their hopes crumbled.
Bay doubled the lead just before the hour-mark as Gareth Evans tapped in before the Motormen were reduced to ten men as Matthew Williams was sent off.
Bay grabbed their third of the afternoon as they exploited the one-man advantage.
Marc Williams switched the play to substitute Cameron Darkwah who beat Nicholas and smashed the ball underneath Zac Jones.
Vauxhall: Jones, Fearnehough (Davies, 29), Wainwright, Hannigan, Nicholas, Clair, Noone, Williams, Tames, Ellams (Rutter, 64), Kosylo (Tuck, 55). Subs not used: Hughes, Mendes.
Twelfth-placed Vauxhall Motors make the short trip to Stockport County on Saturday.