Hello thanks for using 2CarPros.
Yes if the color is dark it is good to change engine oil and filter every year even oil life is 70%. oil can be mixed with humidity over time that oil looses its additives. check fig 1.
check our guide how to replace engine oil and filter:
https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter
fig 2, 3 is for oil quantity and the oil type, fig 4 for oil level check, fig 5 for procedure oil change.
Let us know if you need more help.
Thank you,
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Thursday, April 4th, 2019 AT 11:38 AM