mixing of oil grades

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  #1  
Old 09-11-05, 09:47 PM
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mixing of oil grades

I would like to know if I could mix 5W oil with 20W oil. My 2000 Montero Sport takes 5 quarts of 5W-30 or 5W-40. When I change my oil can I mix one quart of 20W to 4 quarts of 5W. Will this do any harm to my engine. I have about 36Kmi on it. Thanks.
 
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Old 09-12-05, 03:21 AM
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why

Why would you even be considering this? just put 5 qts of the weight you want!!!
 
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Old 09-12-05, 04:19 AM
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...I don't think it will do what you are thinking, mixing two straight weights to make you own multi-grade
 
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Old 09-12-05, 06:29 AM
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I don't even like to mix the same weight oils with different brands. You have a low mileage engine - take care of it and use good oil of the right specs
 
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Old 09-12-05, 07:19 AM
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If the manufacturer specifies 5-30 or 5-40, that is what they believe works best with that engine. Don't try to customize oil. Straight weights may not have the same additives and friction modifiers as the multigrade product.
 
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Old 09-12-05, 10:38 PM
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Thanks. I have a case of 20W-40 and hate to waste it. I know I'm penny wise dollar foolish. I'll use the 5W and hold on to the 20W. Not sure what I'll ever use it for. I'm too cheep to toss it.
 
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Old 09-13-05, 04:35 AM
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Might be a little heavy for small engines, but you could always keep it for the annual oil change in your lawnmower.
 
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Old 09-13-05, 10:25 PM
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Not a bad idea. I'll have a 12 year supply of oil for the mower.
 
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