I had a small service, just oil and filter change around 20 days ago. Since small service, I noticed a drop in fuel efficiency. I checked the oil level to be sure it's not leaking. The Oil level is fine but I noticed a distinct difference in the colour of oil in the lower and upper part of the stick as shown in the picture. The lower part is totally black while the upper is golden. Is that normal or does it suggests a fault in the car on fault in service?
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