Mixing Oil Weights?
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Senior User
Joined: Jan 2007
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From: SE Alabama
Mixing Oil Weights?
Here's the deal, I was outside checking the oil on a couple vehicles. One engine is an old straight six, 250ci, and the other is a 302. Both engines have around 210k miles... I start adding the oil.... My father comes busting out of the house yelling not to put 20w50 into the 250. "It's not good to mix oil weights" he claims... (10w40 was what was already in it)
Ive never heard this in my life and mix oil weights all the time...
Is he right, does it harm the engine to mix weights?
Ive never heard this in my life and mix oil weights all the time...
Is he right, does it harm the engine to mix weights?
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Senior User
Joined: Jan 2007
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From: SE Alabama
Originally Posted by DBKER31
lol that is funny
i think it just depends on how much of the other 20-50 u put in..
if it where me id drain it and just start oveer with new oil!
i think it just depends on how much of the other 20-50 u put in..
if it where me id drain it and just start oveer with new oil!
Post Fiend
Joined: Jan 2000
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From: Metro Detroit (Redford)
Mixing is fine, just don't go to0 thick or too thin.
Maxlife doesn't come in 15w40 (except in Europe), but that wouldn't stop me. I could mix 10w30 and 20w50 to get a 15w40 more or less. So mixing is also useful. Right now I am running 20w40 by mixing 20w and 20w50.
Maxlife doesn't come in 15w40 (except in Europe), but that wouldn't stop me. I could mix 10w30 and 20w50 to get a 15w40 more or less. So mixing is also useful. Right now I am running 20w40 by mixing 20w and 20w50.
Senior User
Joined: Sep 2004
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From: Douglasville,GA
Originally Posted by Americanmadeford
Here's the deal, I was outside checking the oil on a couple vehicles. One engine is an old straight six, 250ci, and the other is a 302. Both engines have around 210k miles... I start adding the oil.... My father comes busting out of the house yelling not to put 20w50 into the 250. "It's not good to mix oil weights" he claims... (10w40 was what was already in it)
Ive never heard this in my life and mix oil weights all the time...
Is he right, does it harm the engine to mix weights?
Ive never heard this in my life and mix oil weights all the time...
Is he right, does it harm the engine to mix weights?
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Elder User
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Ask Dad to show you ONE documented case where it hurt an engine. He won't be able to. You didn't hurt a thing.
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Elder User
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From: northern Michigan
Years ago you couldn't mix brands do to the base oil used. There are two oil bases out there, Texas oils which are asphalt base and Pennselvania base which is parrafin based. Mixing these two causes deposits to occur in the engine. With todays newer refining processes I don't know if it still holds true, But I have always been careful to not mix oils with different bases.
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