We recently did a general overhaul on our Kia Besta 2.7 (J2 engine) We used a Top1 Diesel Oil (synthetic) + Top HD 40 I forgot the oil grade...almost 4months na....Oil price was costly but worth it! I noticed na mas pino ang andar at hindi ganon kabilis umakyat yung temp. remains only at 1/4, saka less smoke compared sa dati namin gamit na langis which is mo40 of petron.