Im running Holden S/C Oil in my.. Its thin but it seems fine to me unless someone can tell me otherwise.. A mate purchased the genuine toyota shit.. $50 for 50ml expensive!!! so got the holden stuff which is like 20 for 100ml i believe.. Either way the viscosity between the two seems almost identical. Again tho.. Its only a guess.. But the genuine toyota stuff is ALOT ALOT ALOT thinner than ANY motor Oil ive seen.. so yeh..