Originally Posted By: Panzerman
I bought a bunch of this at AutoZone clearance. 5w20 Grey bottles. Syn-blend. I put it in my Lincoln Intec 4.6 and it turned black quick, a little too quick. I ve had the car since new and it always got 3000 mile oil changes. No other oil changed black like that oil. Don't know if it was good or bad. I changed it early and put Kendall 10w30 , I scored there too on clearance. After 2000 miles, its still brown. Go figure.
My first car was a 1996 Honda Accord 2.7 V6, I took it to our local mechanic and they use Castrol oils. The oil always turned very dark quickly, and looked almost black on the dipstick after 1500 miles or so. I have detailed records from the PO but I did know him and he is the kind of person to take care of his vehicles. It could have been that the car had over 200K at the time, or that Castrol GTX just likes to darken up quickly. Who knows.