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?
 
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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
 
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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.
 

Patman

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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%.
 
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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.
 
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