http://www.pressroom.com.au/pr...D=225 Read #15 and #16Quote, originally posted by Corolla Press Kit »Toyota has maximised reliability and serviceability by adopting chain camshaft drive, valve clearance adjusters, a replaceable element oil filter, direct ignition, electronic engine control and an air/fuel ratio sensor.This is all I've found so far...(still hunting)
Toyota engineers have adopted roller rockers (with hydraulic lash adjusters which negate the need for valve clearance adjustment) to reduce friction and optimise fuel economy. Thats what I read
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