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which oil grade 20W50 or 15W40


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#11
vikes

Posted 24 June 2004 - 03:53 PM

vikes

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which engine oil spec suitable for a particular car? the best bet is
refer to the owner operating manual.

people like us won't be able or qualified to say which one is the best
blabla....unless you have a lab that can test every brand/type available
in market or you have tried every brand n market.

some engine oil brand claim that theirs is good with ferrari(shell),
castrol(BMX etc...that's because they test for that particular car brand.
doesn't mean it's good for honda or proton etc.

if you feels the difference, likely it's physcological...of course when
you change to new engine oil, it is better than the one you replaced.
after a while, it feels the same.

so, why crack your brain thinking about all these uncertainties. there
are many other factors that affect engine's realibility & longeavity. you
want to think about all that also? wow...so many things to think.

for me it's simple. I bought the engine oil that give good freebies and
cheap....pay RM105 for synthium 1000 + free gift lagi :) for as long as
the viscosity within the manufacturer's recommendation.

even Honda use "cap ayam" brand for oil change at their service centre.
Do you think honda will put bad engine oil grade to their customer's car?
that oil must have been tested specially for Honda car and proven work.

Do you see car manufacturer specifically recommend a particular brand for
their car? never, right? that means any engine oil will do, as long as it
meet the API requirement.

make sense?





#12
911

Posted 24 June 2004 - 04:48 PM

911

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"even Honda use "cap ayam" brand for oil change at their service centre."

What is the "cap ayam" brand Honda use ?


#13
fishbrain

Posted 24 June 2004 - 04:59 PM

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"Do you see car manufacturer specifically recommend a particular brand for
their car?"

Yes I do,
Ferrari - Shell
Porsche - Mobil 1
BMW - Castrol
etc..

Of course there are commercial reasons behind it and any reputable brand
which meets the technical requirements is actually good enough.

#14
hunbeng

Posted 24 June 2004 - 10:02 PM

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hiya guys ,

can you guys really tell me the meaning of the specs 20W50 or 15W40 ?
am really confused becoz some oils have same specs but one is mineral and
the other semi syn , does it make a diffrence ?
i need a full explanation here
thanks
regards

hun beng

#15
tpl

Posted 24 June 2004 - 10:36 PM

tpl

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Original Poster : CarOnly
Original Post : But if you engage in traffic jam under extremely hot
afternoon, protection
to the engine is less if using 15W40 compare with 20W50


caronly u r rite. when using 20-50 my temp. very gud stays low.
rite after changing 15-40 2nd day i went to melaka n back to kl was jam
all the way from melaka till seremban n temp. goin up. sacry...

#16
vikes

Posted 25 June 2004 - 10:28 AM

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here's something i posted in this forum before...

if only one number, it is called single grade oil, ranges from 5W, 10W,
15W, 20W, 20, 30, 40 , 50 & 60. only denotes suitable for low ambient
temp i.e. tested at for cranking viscosity at low temp. thick, slow
flowing oil have high numbers, while thin, free flowing oil have low
numbers.

these numbers are actually viscosity index for engine oil based on SAE
classification and used worldwide.

W denotes suitable for winter use or low ambient temp. No W means oil
grades for use at higher temp i.e. the viscosity are measured at 100 deg C
to ensure adequate viscosity at normal engine operating temp. so SAE 20
and SAE 20W are two different classification. engine temp is about 120-
150 deg C.


if there are 2 numbers like 15W-40, 20W-40 etc, these are called
multigrade engine oil... meaning the oil can be used for wide range of
temperature or commonly called all-season usage. the first number denotes
the oil is suitable for low ambient temperature and the 2nd number for
higher temp rating.

eg, 15W-40, 20W-40, 20W-50 are suitable for lowest temperature of 0 deg
C. 10W-30/40/50 suitable for temp -18 deg C. 5W-20/30/40 suitable fo
below -18 deg C.

very important to understand that SAE viscosity grade classification only
identifies viscosity and indicate nothing else about the type or quality
of an oil or the service for which it is intended.

so which one is good? best bet is refer to car manufacturer's
recommendation for specific car.
--------------

that 'cap ayam' brand is the one with white bottle with red color
writing. They claim Honda did research and come out with special formula
for Honda cars only. cud be true.

between mineral & synthetic? logically synthetic is better because the
price is higher. right? synthetic generally u can do whatever to modify
the oil properties and last longer.

One thing I notice, most big name brand like shell/petronas/esso, the
common engine oil viscosity sold in msia is x-50. may be they know in
msia, we always drive in traffic jam, short distance etc that cause the
engine to operate at higher temp, most of the time.


#17
CarOnly

Posted 25 June 2004 - 01:45 PM

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The Honda engine oil is not cap ayam brand, actually is made from
Idetmitsu Japan which is quite a reputable brand in Japan...

Yes, it's true that xxW50 engine oil is more suitable in hot climate like
in Malaysia (except the small engine car) especially traffic jam
environment in KL.



#18
pwira97

Posted 25 June 2004 - 07:40 PM

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Ya meh? Then why Petronas claim their xxW30 are more protection if
compared with xxW50. They even said that only older-minded people will
think xxW50 are more protective.

#19
hunbeng

Posted 25 June 2004 - 10:21 PM

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thanks vikes for the explanation !

what you mean to say is that xxW50 is better than xxW40 for countries
which are hot and humid like in MY ?

so i assume for the same oil such as synthetic , 10W50 is slower flowing
than 0W50 ?

so i can also assume that we should look for oils with 0W50 as THE best
for our cars ?

maybe we should do a comparison chart of ALL the oils avaiable in our
market ... i think i'll do some notes tomorrow at the petrol stations and
post it up here with their prices too , what say you guys ?

thanks

regards

hun beng

#20
vikes

Posted 28 June 2004 - 08:29 AM

vikes

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hunbeng, i did not say anything about which one good bad or best. but,
that the general idea about engine oil, and up to individual to use which
one he prefers or think good for their car. we dun know what exactly
happening inside the engine, do we?

one thing i notice lately is that many service center now started to use
xx-30, a change from xx-50. I saw one engine oil ad that claimed xx-40/50
are more for high performance, high rev, high temp application, like
racing etc...but that again, for that particular brand.

well, if u can compile what's available in market, even better.