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Nothing, unless you live in Alaska or have a really picky car. Both would work equally well. The numbers indicate the weight of the oil or range of weights. 5w-30 would be a little better in cold weather. The "5" indicates a lighter oil, less thick. Oil thickens when its cold and thins when warm. Again, both would work and usually cause no problems. Just be sure to use a quality oil.

Almost a common misconseption that 'W' does not stand for weight. It actually stands for 'Winter'. So basically as stated above...

5W - Can be used for Negative 20 Degress

10W - Not for Negative 20 Degrees

Hold it - that's a bit misleading - thinner multigrade oils are now common in modern engines. The Ford engines now require 5W oil to operate the hydraulic valve adjusters, using 10W has been found to cause hydraulic locking of the adjuster resulting in loss of performance and valve damage. Synthetic oils are also now specifed as the oil does not break down so quickly. This allows longer service intervals typically 12 months instead of 6 months when using mineral oils.

Always use the oil specifed - apart from advertising a particular make, there is always a reason for the grade

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โˆ™ 2011-09-13 17:59:11
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Q: What would happen if you put 10w-30 motor oil in a car that needs 5w-30 oil?
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10W30 would be used in cold climate. 10W40 would be used in hot climate. 30 and 40 means the thickness viscosity when warmed up.

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If the motor is synchronous, then its speed will not change as the load changes.

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