so i checked my dipstick, and it showed nothing but green. i run valvoline high mileage synthetic blend. its been about 700 miles since i changed the oil. it doesnt smell like antifreeze. and it looks brown on the paper towel, but i have never seen it green before. i know this is prolly gonna be bad, but i was just hoping to find someone out there that has seen this and maybe it is just the oil as it breaks in. at least i hope thats what it is.

 

 

I know in a new engine, the break in oil is sometimes green, but I don't know if it's a result of other lubrications that are on the new parts, or if it is some sort of additive. If it is an additive, then this high mileage oil might have the same sorts of chemicals that result in the green. Other than that, I can't think of anything other than an antifreeze leak. Have you ran this oil before and noticed green?