Using a 10W-40 grade fully synthetic engine oil for your Suzuki Gixxer is generally acceptable and within the recommended specifications for the motorcycle. However, it's important to note that specific recommendations can vary depending on the model and year of your Gixxer, as well as the climate and riding conditions in your area.
Suzuki provides recommendations for engine oil grades and specifications in the owner's manual or service manual for your motorcycle. These manuals outline the recommended viscosity, performance standards, and oil types that are suitable for your bike's engine. It's always a good idea to consult these manuals to ensure you are using the correct oil for your specific model.
If you have chosen the 10W-40 grade fully synthetic oil that was recommended by the service personnel and it meets the specifications outlined in your owner's manual, then it should be suitable for use in your Gixxer. However, if you have any doubts or concerns, it's best to reach out to an authorized Suzuki service center or consult the owner's manual for further clarification.
Additionally, remember to follow the recommended oil change intervals mentioned in the manual and ensure that the oil level is regularly checked and maintained within the specified range. Proper maintenance and using the recommended oil will help keep your engine running smoothly and maximize its performance and longevity.