Originally Posted by Lazurus

Never done the math, nor would I know how to arrive at a final weight of that combo. But wouldn't it be "easier" to simply fill with 5/50? and do you know what combination of viscosity you end up with?

I ask only as one who also once mixed oil weight(s).

Originally Posted by QwikKotaTX

I thought the noise was normal?

Originally Posted by Carlo_Carrera

It works out to 6w-45.

I do it because those two grades mixed come closest to 5w-50 and those two grades are available at Walmart. I only buy engine oil at Walmart. If Walmart sold 5w-50 I would use that.