Checked the dipstick at about 900 miles today after a castrol edge 0w40 fill, already beginning to turn dark and gritty. Prior to doing my own oil changes the car was given whatever bulk syn blend or conventional Firestone carried. Never seen the dipstick darken before a minimum of 3k before. There's a small amount of visible varnish on the oil cap and fill hole I noticed prior to filling.
Anybody had Castrol clean some gunk out?
Anybody had Castrol clean some gunk out?