ysl, esters do live a lot longer den any conventional oil. even the mobil1 needs to be changed once a year only, no need to get those expensive oil (especially racing type oil, they r more about lubricity but less detergenty, so usage for long OCI isnt very good) if u r going for a 10k km OCI only, a good cheaper fully synth will do the same job protecting the engine. chemlube costs around 45/liter kot, at least the last time i asked about it ler..
lucas is d oil if u r looking for a racing oil (i dunno y anyone wud want dis for a road car, as i said less detergent, doesnt keep engine clean for long time, but whteck rite..), 60 per liter but will be really worth it if u r aiming for top performance and protection (its full of moly, lol)