Originally Posted By: demarpaint
Originally Posted By: JCCADILLACMOBILE
Originally Posted By: chet2
i saw some gtx HM 10-40 for 7 bucks a jug on clearance at china mart and i am going to mix 3 quarts of it with 1.5 qts of 5-30 in a cavalier with 190k...i think it would be ok for summer in NH, any comments would be welcome
Ive done this. For that Oil Change, you will have 7.5W-35 Oil... Wont hurt anything, but your Mental state, as it did me.
What viscosity calculator did you use to come up with those numbers? It doesn't work out as simply as adding up the 2 and dividing in half.
I added the two and divided in half, proportionate to the quantity of each grade being utilized.
Are you SURE its not Oversimplifying it? I know there is a Science to it, but i like Math...