Using up leftover oils

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OK to mix 2 M1 5-20's plus 3 MC 5000 10-40's in a high mileage truck? Will it result in a "8-32" syn blend? OK to do this? Thanks!
 
She's gonna blow!

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Originally Posted By: Char Baby
Mixing is fine. Not sure exactly what you will end up with. Something between a 5W30 & 10W30 blend.


Thank you all. Anything between 5-30 and 10-30 will be fine for me in the Texas summer heat. (It normally runs 5-30). If averaging the viscosities are legit, I come up with a "8-32". Thank you all.
 
I did a couple of times. Never had any problems. I mixed Castrol GTX with Havoline DS leftover.
Originally Posted By: gfh77665
OK to mix 2 M1 5-20's plus 3 MC 5000 10-40's in a high mileage truck? Will it result in a "8-32" syn blend? OK to do this? Thanks!
 
I have some left over Havoline 5W30 API SL, and some Formula Shell 5W20 SPI SM that I will be mixing together. I don't see any problems, if anything the SL oil will boost ZDDP a little.

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