FATAL1TY - X

always use a ring spanner/plug spanner/twrench to remove the bolts on the engine. some bolts are made of soft metal which will get damaged if you use an open mouth/monkey wrench. i learned it the hard way.

i broke an edge of the engine oil drain bolt of my r15 during first service. problem was that i used an open mouth spanner. the r15 engine oil drain bolt is aluminum and is super soft. however fz uses iron. tightening torque is also important. if you are not familiar with tightening torques, finger tighten the bolt and then tighten the bolt lightly(around 1/4 - 1/2 turns) using the spanner, ride around sometime and see if there is any oil leakage. tighten it until the oil stops leaking. and also try to use short spanners.

usually 1/2 - 3/4 turns after finger tightening will do to get it properly tightend when using a new drain bolt gasket.

torque wrench is only required if you are into doing serious engine works. a good torque wrench costs more than 4000rs. buying a torque wrench just for doing an oil change seems ridiculous.

sniper

A slightly loose drain bolt will leak a little oil, but an over-tightened drain bolt will need an engine strip down.
Its best to go easy on the tightening. drain bolts, though bigger don't require too much of torque (coz the engine casing is aluminum). simply put, if you find oil dripping after tightening, tighten a lil bit more then check again. this is a foolproof method.
I have often seen first timers wreck the treading by turning the drain plug in the wrong direction while loosening. Its very easy for someone not used to drain bolts to lose his sense of direction so its best left to your mechanic who usually won't charge to change the oil.

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Shreyas
Sniper Automotives
Performance Parts & Tuning- Ph:9820768083
www.sniper-auto.com