Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_69 (year INTEGER, entrant VARCHAR, points VARCHAR)

### Question ###
What was the sum of the years, when the entrant was Scuderia Centro Sud, and when there were 6 points?

### Accurate SQL ###

SELECT SUM(year) FROM table_name_69 WHERE entrant = "scuderia centro sud" AND points = 6