Quote Originally Posted by kompressor View Post
the 5w-10w rating will not matter because we live in a tropical climate. you should look at the other viscosity number which is the one during operating temps (the second number). kahit magpalit ka ng 5w-30 to 10w-30 eh manipis pa rin ang operating temp viscosity niyan kasi hindi naman nagbago yung "30".

kung sa tingin ng mechanic mo na mas malaki na ang oil journals in between the bearings coz of its age, then probably try a viscosity that is in the 50's range (heck, I've already seen a 10w-60 oil)
higher viscosity rating like 50 and 60 re suited for two kinds of engine...
1. poorly maintained vehicles with low compression and is consuming oils.
2. racing engines (redline has 10w60 0r 15w60 i think, same with other racing oils)... Due to the fact that this oils are use for TRACK days and LAPPING around a circuit which an engine is driven at redline on the tachometer most of the time.... which i don't think your engines are capable and even built to do.

If you want to conserve fuel use a 0w-5w to starting viscosity and a 40 operating viscosity
if you want better protection at stop and go traffic during summer use 10w to 15w starting viscosity and 40 operating viscosity