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i bought my car from a used car dealership and when we got it we were thinking of doing a short interval oil change, It had 76k miles on it. We drove it maybe 500 miles and decided to change the oil and it was black. It seems the dealership hadn't changed the oil in a very long time. We put 10W-30 in it then mobil 1 full synthetic.
When we changed the oil just a few days ago the oil still looked good nice golden brown color. We drained a quart then put in the motor flush, idled, then drained the rest of the oil out and the oil turned black. We put in 10W-30 Mobil 1 full synthetic for high mileage vehicles and that's where we are at now. We are going to change the oil out this friday with Castrol Syntec full synthetic 10w-40 and an STP filter I'll let u know when i'm done. I'll also note the color and the look of the oil at the final oil change.
Walmart has an abundance of good oils at a reasonable price if you're going to do this i reccommned shopping there. They had more than Castrol brand 10w-40 but i decided to go with Castrol.
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