What is the relationship between Castrol and BP in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

BBS Engineering offers services to most of the active oil companies in Ghana and is the main representative for Castrol BP lubricants and Sealite UK Ltd (Marine Navigation Aids) in the country.

Answer: parent_organization