Yo guys, sorry for the late reply. Had a long long holiday in Malaysia (drove to Penang, Ipoh, etc)
To answer some questions:
1. Autosaver's price for the plugs (Model: FXE20HE11) is at $42.00 each. Labour charge is $60.00. Total damge: $228.00 (b4 GST)
2. I did not keep the old plugs. But a gimplse of it is that the threads (whatever you call it) looks worn and they confirmed that mine is really due for replacement (my second-hand car is at 98K milleage)
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bro iagree, woah. at that milleage clocked, i see why the TCM package is for you :)
bro latioR, yap. more than 2 tanks liao. I detect no significant change to my FC in my last 2 locally-travelled tank. So now only comfort myself that I did it for safety's sake?

THis may not be related. But... i clocked 600km on a full tank of Esso 5000 petrol on the NS highway. (my personal best) That together with another half tank of Malaysian V Power is enough to take me to Penang
