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Manual transaxles are often lubricated with specific types of gear oils rather than engine oils or automatic transmission fluids. The correct choice highlights the fact that in many instances, a high-quality 5W-30 engine oil is sometimes used in manual transmissions due to its viscosity and lubricating properties, particularly in certain older or less common vehicles where the manufacturer's specifications allow or recommend such oils.
However, it is more common for manual transaxles to use specialized gear oils that comply with specific viscosity levels and performance ratings distinctly suited for gear operation. These oils typically provide enhanced protection under increasing loads and reduce wear and friction more effectively than standard engine oils.
On the other hand, automatic transmission fluid is not suitable for manual transaxles because it lacks the necessary properties to effectively protect the gearing systems found in manual transmissions. Automatic fluids can lead to inadequate lubrication and could potentially cause severe damage.
The essence of the question revolves around the specific lubricants suited for manual transaxles, reinforcing the importance of understanding manufacturer recommendations and the properties of lubricants in automotive applications.