Grosjean started back in 19th place following a five-place grid penalty as his E23 required a new gearbox.
The French speedy successively completed 55-lap Abu Dhabi Grand Prix and securing two points for Lotus in his final grand prix for the team, who moves to new entrant Haas F1 next season.
“It was a tough race but we knew with the right strategy we could do something good and the last stint was key,” he said.
“It was the best way to leave the team, scoring some good points and having a good race.
“The team deserves it and I’m very proud of the gift I’m leaving as a present. It’s been an emotional journey for me and I’m so happy to be able to reward everyone at Enstone with points.”
Teammate Pastor Maldonado’s race ended at the turn one following he was crashed into by Fernando Alonso, and it’s forced-out him with suspension damage.
“It’s sad to end the race in the first corner because we were looking good for the race,” Maldonado said. “Today we had a good strategy to go with our better race pace, but anyway this is racing and it can happen.
“I didn’t see the contact I just felt it in the back of the car from Fernando. I tried to restart but then I saw the suspension damage. Imagine if that incident had been the other way round, it would’ve been big news then!”