You might want to add a few things. Car model/Year: 2005 Corolla Sportivo KM on engine: currently approx 66,000km Current engine oil: HPR 0, 0W-40 Price: Got it at discount; $50ish Current gear oil: Royal Purple gear oil, 75W-90; also Nulon G70 gear addititive. Price: Royal purchased at discount, $75ish for 3 quarts. Nulon G70 approx $17.00 Notes: 0W-40 a bit too thin for the Perth summer ;) Possible future engine oil: Just purchased Nulon 10W-40, was approx $55.00 Possible gear oil: Not changing anytime soon... Also in regards to what is the 'best' oil, I think that most oils are good. As long as you service it regularly and keep it topped up, the engine will run for a long time.