QUOTE(ziggy87 @ Dec 23 2012, 01:23 AM)
"5W40 can only be used for ambient temperature not exceeding 20 deg C."

I still remember very clear when that guy pop this in during our "argument" on EO viscosity in Preve thread....I almost fall of the chair laughing reading that. The thing is....I think he REALLY BELIEVE IT...
Added on December 24, 2012, 10:10 amQUOTE(nickzkuso @ Dec 23 2012, 12:38 AM)
Mahal Nya.. If 5w means thinner and better a?
I think it's ok to use fs even for 5k interval if it's reli protects our engine

Of course the lower the better it is as in general the lube is slightly more liquid during cold start. Good for engine.
However if you overused the lube, used until addictives habis, still using (extended period)...then it become worse than the 10W lube. Coz is the bigger the gap between cold and normal viscosity (ie. 5W40, 10W40), the more addictives are used to bridge the gap. So when addictives finished, the VI will revert to original viscosity before addictives (further apart means more addictive will be wear out). This is however a mute point if you service on schedule.
Using FS for 3K pun boleh if you're rich enuf. I love my car too much....so I used for 5K servicing only. Recent advancement of EO tech makes me think it will be safe to go up to 7K or so. Not sure after that. I still retain 5K tho coz my City only hit that in abt 5 to 6 months. The longer the period, FS with more synthetic base will oxidize less than pure mineral and semi. If you use 5K within a few months, I don't see much difference between semi and FS except less engine vibration (good for engine), smoother drive, more comfortable but engine protection is equally good....
This post has been edited by Cavino: Dec 24 2012, 10:10 AM