Mixing 5w-30 with 10w-30; Mobil 1 ???

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par

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Is there any benefit/harm in mixing different weights of M1?

My Tacoma manual call for a 5w-30 year round but it says that 10w-30 can be used in the summer. I'm due for an oil change and I was thinking about mixing in 2 qts of 5-w30 with 3 qts of 10w-30 ... to sort of cover all the bases. I live in the south where it's starting to get warm and it's real hot in the summer.

Is mixing illogical?
 
I would just use the 10w30. The 5w30 should be fine,but if you insist on using something a tad thicker use the 10w30. I may run 10w30 in my Tacoma when the next interval is due.

Daily Drives:
-2003 Toyota Tacoma PreRunner XtraCab, 2.7 Liter , Mobil1 Synthetic SS 5W-30.
ODO 8350 Miles.
-1995 Toyota 4-Runner 3.0 V6, Mobil1 Synthetic SS 10W-30.
ODO 84500 Miles.
http://community.webshots.com/user/amkeer
 
It gets pretty dog-gone hot here in the summer, and this is what I do during the worse part of the season...mix 2 quarts of M1 15W-50 and 4 quarts of M1 5W-30. I really like the high HTHS that the 15W-50 has for my 01 F150 5.4l engine.
 
quote:

Originally posted by par:
Is there any benefit/harm in mixing different weights of M1?

My Tacoma manual call for a 5w-30 year round but it says that 10w-30 can be used in the summer. I'm due for an oil change and I was thinking about mixing in 2 qts of 5-w30 with 3 qts of 10w-30 ... to sort of cover all the bases. I live in the south where it's starting to get warm and it's real hot in the summer.

Is mixing illogical?


To be completely honest, you could run 100% 5w30 Mobil 1 in the summer and be just fine, or you could run 100% 10w30 Mobil 1 and be just fine. Don't worry about mixing, just choose one of the two and go 100%.
 
I've used M-1 since 1986, with outstanding results (although I'm trying Amsoil at the moment for comparison/test purposes). The 10w-30 joined the lineup about 10 years ago, and I've used in in the summer several times since. During seasonal overlaps, I've mixed a leftover qt or two of one with the other grade, and never noticed the slightest difference. You will be fine mixing if you want to try that.
 
NO, your engine will EXPLODE!!!

Just kidding, somebody had to say it.
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