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Only those with large fleets of cars or trucks
Keep the kind of statistics that enable them to cost justify their oil change intervals. How would you or I ever quantify Jake's track car versus my go to the dump car (with occasional blasts and one 6k+ revs romp every trip) versus your usage?
The closest we can come is for people like JFP and Jake who see dozens of engines a month and who do UOAs and record the engines history to tell us their conclusions after they analyze their data. And they universally say change early and often.
Its good enough for me.
(How long has it been since you changed your brake fluid? Said as one whose son lost his ABS system because the brake fluid had absorbed moisture over 8 years and took out about $1.5k in parts on his '94 Mazda.)
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