"Buggy Grail" is a side quest of The Following expansion pack in Dying Light.
The quest is obtained from Bilal at his gas station towards the north east of the Countryside map.
Bilal said that I should check out a Silas truck stranded on a highway. It's probably filled with useful parts we could use to maintain and upgrade my car.
- Get to the Silas truck stranded on a highway.
- Talk to the trucker.
Completing this side quest unlocks the ability to trade with Greaves, the trucker. He becomes a store owner and specialises in Buggy components and craft parts.