What fluid goes in a 1995 Ford Aspire manual transmission 90 wt came out but says Mercon?

The presence of Mercon fluid in a 1995 Ford Aspire's manual transmission is unusual and indicates a problem. Manual transmissions use gear oil, not Mercon (an automatic transmission fluid). The fact that 90W gear oil came out suggests someone may have attempted a repair or incorrectly filled the transmission at some point.

You should NOT put Mercon fluid in a manual transmission. This will severely damage the transmission.

What you need to do:

1. Identify the correct fluid: Consult your owner's manual or a reputable parts store (like AutoZone, Advance Auto Parts, or Napa) to determine the correct type and weight of gear oil for your specific 1995 Ford Aspire manual transmission. The weight might be 75W-90, 80W-90, or something similar, but 90W is a possibility.

2. Drain and flush: Completely drain the existing fluid (which is contaminated with Mercon). A thorough flush is recommended to remove as much of the Mercon as possible.

3. Refill with the correct gear oil: Use the correct type and amount of gear oil specified for your transmission. Overfilling can be just as harmful as underfilling.

4. Check for leaks: Inspect the transmission for any leaks while you're working on it.

In short, the Mercon is a mistake. Get the right gear oil and properly service the transmission to prevent further damage.