When selecting an alternate semi-synthetic engine oil for your Suzuki Gixxer 155cc, it's important to consider the manufacturer's recommendations and specifications outlined in the owner's manual. The recommended oil viscosity, such as 10W-40, indicates the oil's thickness and its suitability for specific temperature ranges.
To find an alternative oil, look for a semi-synthetic engine oil with the same viscosity rating (10W-40) that meets the required specifications and certifications mentioned in the owner's manual. These specifications typically include API (American Petroleum Institute) ratings, such as API SN or API SM, and JASO (Japanese Automotive Standards Organization) specifications, such as JASO MA.
You can explore other reputable brands that offer semi-synthetic engine oils, such as Castrol, Shell, Mobil, or Valvoline. Check their product labels or websites to ensure they meet the necessary specifications for your motorcycle.
Additionally, consulting with a Suzuki authorized service center or a knowledgeable mechanic could provide valuable insights and recommendations based on their experience with your specific motorcycle model.
Remember, it's crucial to adhere to the manufacturer's recommendations to ensure optimal performance and longevity of your motorcycle's engine.