Castrol rhymes with:
biocontrol, filtrol, tricentrol, biocontrol, clairol, filtrol, naral, tricentrol, agarwal, aircal, algol, berdahl, bergdahl, bergendahl, biocontrol, caterwaul, clairol, consol, ebersol, engdahl, erdahl, ethyol, ewbal, felbatol, filtrol, firewall, jaspal, jordahl, kcal, kufahl, laventhol, liljedahl, lubrizol, malval, naral, nordahl, o'driscoll, odriscoll, offerdahl, oftedahl, opsahl, pentothal, phenol, photocall, pofahl, pufahl, ransall, repsol, ringdahl, sandall, scurdall, snowfall, stordahl, stovall, sturdhal, topol, tricentrol, vertol, vorpahl
Castrol sounds like:
caterwaul, cathedral, catterall, cotterill, cottrell, cottrill, cuthrell, cutrale, cutrell