Hi Newbronner Steven! To answer your questions, please check the following below:

1. Singapore citizens, Permanent Residents and holders of passes issued by ICA and MOM are NOT allowed to keep and use a foreign-registered vehicle in Singapore. An exception is made for certain MOM work pass holders who do not reside in Singapore. For more information, please check this link: https://onemotoring.lta.gov.sg/content/onemotoring/home/driving/entering_and_exiting_singapore/cars-and-motorcycles-registered-in-malaysia.html

2. A Singapore license can drive in Malaysia as long as you are not staying in the country for longer than 90 days. If you are using a foreign driving license in Malaysia, make sure you bring your full license (including any paper part) and that it is in good, readable condition.

3. Any person who is not a resident of Singapore, but holds a Work Pass issued by the Ministry of Manpower, may drive a foreign-registered vehicle in Singapore if ALL these conditions are met: https://onemotoring.lta.gov.sg/content/onemotoring/home/driving/entering_and_exiting_singapore/cars-and-motorcycles-registered-in-malaysia.html#:~:text=Any%20person%20who%20is%20not,registered%20owner%20of%20the%20vehicle

4. Yes, Malaysian can drive a Singapore registered car into Malaysia.