actually, i doubt they will be able to tell what API or oil viscocity tat we're using unless they go and do the trials.

higher viscocity will make ur engine feel heavier due to thicker oil. your engine needs more energy to move the oil around the entire engine block. best to keep to the recommended 10-30w oils. 5-30w is also ok as well when the engine is new because of the tighter tolerance.

using 10-30w will allow u to rev easier and also save fuel on the long run because your engine is moving is lesser effort.

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Added on June 29, 2009, 8:08 pm

eagle eyes brand seems to be good. ask around the forum for a review.  

buy to replace +2

In a 10w-40 for example the 10w bit (W = winter, not weight or watt or anything else for that matter) simply means that the oil must have a certain maximum viscosity/flow at low temperature. The lower the "W" number the better the oils cold temperature/cold start performance.

The 40 in a 10w-40 simply means that the oil must fall within certain viscosity limits at 100 degC. This is a fixed limit and all oils that end in 40 must achieve these limits. Once again the lower the number the thinner the oil, a 30 oil is thinner than a 40 oil at 100 degC etc.

After few tank test, my gen-2 still eat a lot petrol. Im driving like 70% highway since im working shift ...
very unlikely rm60 can last 300km only .. n im not heavy right footed or like to rev guy. car still stock condition ...

Im not sure wat prob or what ... the SC just insert the device to my car and it shows 'no error' then he say no problem d ..

so far i think of engine oil 15W50 and maybe timing. but i heard it wont affect fc tat much though ...

car mileage juz <10k

The SC (COE) also put this 15w50 oil into my engine during the 5k km service. The foreman said it is to 'cleanse' the engine from any metal debris before going for fully synthetic during the 10k km service.