Quantum Synta semi syn 10w40 Mobil Super 2000 semi syn 10w40 Shell Helix HX7 full syn 10w40 Castrol Magnatec semi syn 10w40 Millers Trident semi syn 10w40 Used all of these at one time, trident used to be called XSS, they are all the same, I just buy the cheapest at the time. Use a genuine filter, the oil does seem to stay cleaner for longer with a gen filter.