Cummins Engine Company and Bosch(sparkplugs) have extended their contracts with The Valvoline Company through the year 2000. The contract extensions mean that the associate sponsors on the #6 Valvoline Roush owned Thunderbird driven by Mark Martin will be with the team for the next 3 seasons. Valvoline announced in April that they had extended its contract with Roush Racing through the year 2000(6-2-97)
