Semi-Synthetic Engine Oil SAE5w30 API SL/CF is a mixture of fully synthetic oil and conventional mineral oil. Semi-synthetic oil can achieve higher levels of performance than mineral oil alone. If you do use semi-synthetic engine oil instead of fully synthetic oil then it is unlikely to cause any drastic or immediate problems. #BestEngineoil #Engineoils #Comparison #semisyntheticengineoil #semisyntheticengineoilforbike #syntheticengineoilforcar #semisyntheticengineoilSAE5w30APISL #danalubes #u