It only go to 70
My car has 170000 miles.
My car's transmission is unknown to me.
Hi there - auto manufacturers, as an informal standard, design operating gauges to align the needle in the middle of the gauge. This should be "90" on your gauge I believe (Celsius). This would suggest that your thermostat is not staying closed enough to let the engine get up to proper operating temperature. I recommend a thermostat replacement service performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.
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