Hi,

I have used your oil selection table but there are a few options still! Our navara np300 has 90,000km, occasionally tows a boat and we are on the Gold Coast-so not the coldest. I used the C4 last time but the C3 is listed as preferred and there are a couple of other options. Which is the best? Does C4 mean at a higher standard and all else is the same? Are all the qualities of the enviro+ also same for C3 and C4? Being spoilt for choice has made the decision harder! While I am asking, what interval do you suggest changes as the manufacturers interval is 20,000km (They list many typical service items without any prescribed intervals-ATF being just one...).

Thanks,

Rob.