change oil...

[WeaponX]

your milage probably went down because of the change (if at all) of the viscosity of the oil, and not the kind (mineral, semi or full syn). thicker oils will tend to put a little bit more strain on the engine causing it to be worse with the milage.

learn how to pick the correct viscosity for your car... to thick or too thin is bad for the engine.

What brand/viscosity would best suit a 99 Civic Vti? I'm after increase in mileage too. Also, a change interval of 5K Kms is good for me but I would prefer trying 10K as long as it benefits me and my engine.

I'm not really familiar with viscosity so I don't know how thick or thin I should put in my engine. Does it depend solely on the engine type? Shell synthetic oil or the Casa Oil (can't remember the viscosity) is usually being used on my scheduled maintenance. I tried the 10K Kms oil of Casa but I feel that their regular or ordinary oil perform much better.

[orly_andico]

according to an article i read (linked from here!) all engine oils have a design viscosity of 10 at operating temperature. So it's not true that a 20W50 is "thicker" than a 10W30. They are both 10 at operating temperature. The 20W50 is "thicker" than the 10W30 at LOW temperatures. Which only happens when you're cranking the car. Even in subzero temperatures the engine will be at 100* Celsius or higher (of course! due to combustion..)

[speedyfix]

uhm, that is definitely not true...

why would manufacturers make a multigrade oil kung parehas lang pala lahat ng oil once they get operational? kung ganun dapat monograde nalang. the very fact that there are 2 viscosities (i.e. 10w40) means that the oil flows differently in different conditions.

10w40, 5w50, 0w40, 10w30, etc etc etc... will all have different characteristics and will suit different engines.

best bet would be to look at the manual of the car and see what the engine recommends.

try doing more research narin about oil. there are also lots of other facts such as what the base stock is made from, it being ester based or non ester, how strong the detergent properties are (i.e. race oil has hardly any detergent qualities which means it can't be used for a prolonged time on the road), etc which will show you the quality of the oil and how much research and development went into it.

this whole oil thing isn't as simple as it seems...

goodluck.

[jnqlz]

well to be exactly sure all I do here in Africa,Schedule Oil Sample,for this I know when will be the next oil change depending on the quality of oil we use. Sa Philippines.I do it at 5000 km

[jnqlz]

well to be exactly sure all I do here in Africa,Schedule Oil Sample,for this I know when will be the next oil change depending on the quality of oil we use.

[orly_andico]

speedyfix,

actually it seems that detergency etc. these days is all the same. it's hard to find an oil that isn't SL-CF rated. the point in the article that i read was that, using a swankier oil will HELP YOUR ENGINE AT LOW TEMPERATURES. that was the only point i was trying to make. at operating temperature, ALL OTHER THINGS (e.g. detergency) being equal, both oils will perform in roughly the same way. Of course at elevated temperatures like in a high-revving car or a force-inducted car the second number will then come into play. At that point, yes, a 20W50 WOULD be thicker than a 0W30. But under NORMAL operating circumstances, they'd both be viscosity 10.

Of course it's generally also true that all things are not equal, e.g. a swanky synthetic oil would have better detergency ratings than a lowly mineral oil. But I've seen mineral oils with SL ratings. Although meron pa ring SJ...

[speedyfix]

ok dude, now i get your point

[marvin]

i change oil every 5 thousand km or at least once a year which ever comes first.
i use elf synthese fully synthetic for my gasoline engines and elf performance trophy for my diesel engines.

[Mojo]

Revx, pinakamura binibili ko, wala ako na pansin pag kaiba sa mamahalin engine oil para sa diesel,

every 3k km or 3 months palit Oil filter at oil, total expenses for oil change 500 pesos, so it makes sense magpalit lagi , kesa mag synthetic ako.


parang tapon sa pera ang synthetic, unless i sagad mo isang taon ang change oil mo hehehe pero medyo delikado ka na dun.

[ET1]

Meron na ba sa inyo gumamit ng Top Oil synthetic motor oil? Feedback naman po. Tempted akong gumamit dahil mura siya compared with other brands.