Can you mix synthetic engine oil with regular oil?

Answer

Synthetic and regular engine oil can be mixed together. It is also possible to buy premixed oil, which may give some indication about its expected lifespan.

Synthetic and regular engine oils are similar, but synthetic mixtures tend to last much longer. Premixed oils are rated to last longer than regular oil but not as long as synthetic oil. It can be difficult to determine how long a custom mixture should be kept before it is changed, and waiting too long can have a negative effect on engine performance. Checking mixed oil on occasion can indicate if it needs to be changed.

Reference:
Q&A Related to "Can you mix synthetic engine oil with regular..."
1. Check the oil and determine the type of oil used in the engine. The viscosity of the regular oil should be the same as the viscosity of the synthetic oil. For example, 5W-30 regular
http://www.ehow.com/how_6520121_mix-synthetic-regu...
Nothing, it'll be fine. If you read the fine print, it'll usually state that it's blendable.
http://wiki.answers.com/Q/What_happens_if_you_mix_...
Here's a practical chemistry question for you. Do you know what happens if you mix regular and synthetic motor oil? For example, let's say the mechanic put synthetic oil in your car
http://chemistry.about.com/od/geochemistry/f/What-...
If using regular oil after an oil change
http://www.chacha.com/question/what-happens-if-you...
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