it depends on the car and how many miles it has on it
As far as I know all GMs with the remote oil sending unit require 5W30.
what oil viscosity should i use a gsx 1400
You should use 5W30. That is the recommended weight.
5-30 weight SM rated oil.
5W30
The manufacturer recommends that you use 10W-30 weight oil. 10 W-40 weight oil can be used in high mileage engines.
Factory said to use 5W30 weight.
If it is not burning any oil use 5w30. If it is burning any oil use 10w30.
The oil capacity of a 99 Ford Escort is 4 quarts. Use 5W-30 weight oil. Use a SM rated oil which is the highest rating.
5W30 weight.
Recommended oil is 20w50
5w30
If the 2000 Nissan Frontier has fewer miles on it, it is recommended that the oil weight should be 5w30. If the car is more miles on it, the recommended oil weight should be 10w30.