Whad'ya think of this mix?

[Palut]

(All oils in this post are Mobil 1)

I went to Autozone and Schuck's and ended up with 4 quarts of M1 0W-40 SM, 5 quarts of 15W-50 SL, and 28 quarts of 0W-20 SL, for $1.50 or $2 per quart. My car takes 4.5 quarts of oil on each change, so I'm thinking of mixing the 15W-50 and 0W-20 like this:

2 qts 15W-50 and 2.5 qts 0W-20 to give me oil with vis at 40°C of 69.5 cst and vis at 100°C of 11.7 cst, and a viscosity index of 164.

When I run out of SL 15W-50, I was planning on using M1 EP 15W-50. I'd use the 0W-40 and some 10W-30 I've got as top up oil.

What do you guys think?

I got these figures by using the ever so handy mixing calculator.

 

[Bryanccfshr]

I wouldn't have a problem doing iot. I am kicking myself for not cleaning out the 0w20 and 0e40 stock when I ran into the motherload and cleaned out the 0w30 stock..

Good oil for the home viscosity blender.

 

[Palut]

Thanks for your input Bryanccfshr.

Does anyone have any idea how accurate that blending calculator is? I know that its not going to be exact, but I'd like to know how much room for error it needs.

 

[pitzel]

quote:

---

Originally posted by Palut:
Thanks for your input Bryanccfshr.

Does anyone have any idea how accurate that blending calculator is? I know that its not going to be exact, but I'd like to know how much room for error it needs.

---

I don't think you will ever notice any 'errors', but if you want to determine the maximum bounds of error, why don't you put in the maximum cST range for each oil in the mixture, and the minimum cST in a subsequent calculation and see what you come out to get.

I suspect the overall cST error won't be any worse than what you would experience with a product like M1 10W-30. Shouldn't really matter, and as the VOA here have shown, Mobil1 usually comes in darn close to spec anyways.