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Old 12-11-2001, 12:06 AM
elau's Avatar
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Join Date: Nov 1999
Location: MD.
Posts: 1,725
Mixing oil?

I have read a couple of threads that you should not mix oil. Can someone explain what would happen if you do? Say, I am using 10W30 in the engine and then add a quart of 10W40 in the fix. What will happen inside the engine? I am always curious about this topic.

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Old 12-11-2001, 01:05 AM
Ali Al-Chalabi's Avatar
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Join Date: Nov 2000
Location: Knoxville, TN
Posts: 1,837
Nothing will happen if you mix. It is a requirement of oil specifications to be able to be different kind of oil without any adverse effects.
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
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Old 12-11-2001, 03:35 AM
ymsin's Avatar
Driver, Mercedes-Benz
Join Date: Feb 2001
Location: Malaysia
Posts: 1,645
Ali's right.

The difference would be more significant had it been a mix between synthetic and conventional oil.
... Kerry

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Old 12-11-2001, 09:01 AM
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Join Date: Jul 2001
Location: Western Michigan
Posts: 1,080
Right, nothing will happen and your engine will not notice it.

The viscosity may rise a bit due to the addition of the 10W-40, to something like 10W32.:p
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