Sorry this is kinda long. I have an 07 impreza wrx with 36000 miles. I have been reading some of the threads on oil. I have seen not to use 5w 30 and also have seen that 5w 30 is noisy in our motors. Which i am getting some noise out of my motor. I am sure there is 5w 30 in the motor cause thats what the dealer put in it when i bought it. Also according to those motor oil bibles i have been reading. If i am understanding some of that stuff right. The number before the w stands for cold viscocity and the number after stands for hot viscocity.
To try to get rid of the noise and for better protection would it be better to use 10w 40 instead of the 10w 30 because there is only the cold viscocity number change.
Also anyone ever use or heard anything good or bad about that lucas oil additive good idea or bad idea to use
Thanks in advance.