Flushing oils are usually 10W-20 oils lang na panglinis. Too thin to use for driving. If you believe na madami ng sludge na nagaccumulate sa oil pan mo then it would be better to let sleeping dogs lie if you do not want to manually clean the pan. Magbabara lang yun engine mo kung mabubulabog lang back into circulation yun dumi. check out www.chris-longhurst.com/carbibles It will answer most of your questions. hope this helps.