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So it turns out that there were a few extra oil changes unaccounted for, which eased my worries about the car. I took it for a compression test as per @larson701 advice, and it checked out. All cylinders were nearly even. So even though the oil change intervals had been slightly long, no...

I believe it was the oil pressure light. An oil pressure gauge sounds like a good idea! Would be nice to find someone to come on site and do it.

Hello, I'm in the middle of buying a used 2005 Mazda 3 with 156,000km (97,000 miles). It appears to be in great condition, except for the fact that when I pulled the dipstick out, there was no oil on it. She went to get an oil change the next day. Records indicate she did 1 oil change in...