I'd use the heavier 10-40 or 20-50 in older cars, plus Lucas, and Liqui moly to make it last.. Dave
anywhere from 10w30 -10w40
10w30
10W30 or 10W40 for higher mileage
10w30 or 10w40, 2.10 L
Something that old is going to stand something like a 10w40, or 10w30. Check the door,there is often an oil recommendation there or under the hood.
Engine oil should be 10W30, 10W40 or 30W. If the vehicle is operated in extreme heat environments, 20W50 may be considered, check with a local dealer or parts shop.
Use 10W30 and do not use 10W40 or straight 30W.
10w30 weight
SAE 10w30 any major brand.
5w30 or 10w305w30 or 10w30
http://www.batterymart.com/p-12v-mazda-miata-battery.html this should help
10w30