It is better to drain oil rather than use an oil extractor because it seems the extractor will leave behind some a significant amount of oil whereas a drain will get out significantly more.
However I take it’s still ok to use an extractor since the remaining bad oil will get mixed with the new oil. But since the overall quality is lower it simply means your engine or transmission never gets really fresh oil but you just need to do oil changes more often e.g 2-3 times a year rather than evey year?
Would you agree?
Or would The difference In a yearly drain vs regular attraction affect the engine significantly can’t such that it’s better to do a drain everytime?