The best oil grade for the Kawasaki FR691V engine is SAE 10W-40. This oil grade is recommended for its ability to provide optimal lubrication across a wide range of temperatures, ensuring smooth engine performance and longevity. Kawasaki specifies this grade in their manuals, acknowledging it as the most suitable for the varied conditions under which the FR691V operates. While 10W-40 is preferred, in extreme conditions, alternatives like 5W-20, 5W-30, or SAE 30 can be used based on the temperature range you are operating in. However, sticking with 10W-40 ensures the engine is protected under most normal operating conditions.

The oil grade 5w30 refers to the viscosity level of motor oil, which indicates how easily the oil flows at different temperatures. The "5w" suggests the oil's performance at colder temperatures (the "w" stands for winter), meaning it has a viscosity rating of 5, making it relatively thin and capable of flowing easily even at low temperatures. The "30" refers to the oil's viscosity at engine operating temperatures (around 100°C or 212°F), indicating it is medium-thickness oil that can maintain stable lubrication and protection for engine components under normal driving conditions. This multi-grade oil is designed to provide a balanced performance, ensuring smooth engine starts in cold weather while maintaining enough protection at higher temperatures, making it suitable for use in a variety of vehicles and environments.

When washing out hair dye, the decision to use shampoo hinges on the type of dye used and the product's specific instructions. Semi-permanent dyes often recommend rinsing with water only to prolong the color's life, as shampooing too soon can strip the dye more quickly. However, for permanent dyes, manufacturers usually suggest using a mild shampoo after the initial rinse to remove any residual dye from your hair and scalp and to ensure the hair cuticle is closed properly. In general, it's advisable to wait at least 24-48 hours after the dyeing process before using shampoo to maximize color retention. Using a shampoo designed for color-treated hair can help maintain the dye's vibrancy for a longer period.