moving from 10w-40 to 5w-30. isit okay?

[Super-DA9]

i'm just saying thats where my knowledge on oil comes from mang. i did say beforehand that I'm open to anyone that can provide evidence of medium weight oil damaging b18c's.

there's been statments saying it's bad but no one has given a "why" yet. I can tell you why it's not bad but as you stated, I work at an auto shop so I'm not a guru I just know what I've learned there.

[hmetro24]

i'm just saying thats where my knowledge on oil comes from mang. i did say beforehand that I'm open to anyone that can provide evidence of medium weight oil damaging b18c's.

there's been statments saying it's bad but no one has given a "why" yet. I can tell you why it's not bad but as you stated, I work at an auto shop so I'm not a guru I just know what I've learned there.

It is not the oil, it is the way the car is driven and the way you maintain the car

[chauster]

i think you need to get your eyes checked byuddy.

i've seen alot of oil in my life and thats definitely 15w-50

[Super-DA9]

It is not the oil, it is the way the car is driven and the way you maintain the car

that is part true, but if you put an oil that is too thin for the engines internal age, regardless of it's good maintainance history it would still burn, no?

[TbM]

well I work in an auto retail store so it's part of my job to know about oil, but if I'm proven wrong it'll be some learning for me anyway.

Well i work as a security guard so its no part of my job to know about oils but i know you are incorrect and should not be giving out advice to people.......

The First number is the viscosity at low tempratures. so 5w is thinner than 10w.

the second number is the viscosity when hot. the higher the number the thicker the oil at running temprature.

Saying 10w -70 is no thicker than 10w - 30 is just plain fail.....

Regards,
I dont even........

[Super-DA9]

thats a harsh way to say it man, i still don't get why people get so angry on forums :/

in some ways you are saying the same thing that I did in different words, thickness or "weight" and "strength" are words I'm used to using so people understand it easier. yes the "w" is the thickness when cold, therefore the natural thickness of the oil itself, correct?

if the second number is the thickness when hot, doesn't that also reflect it's ability to not burn at high temperatures? the strength?

however this can be argued as I've read that oil thins out when it heats up. :/ confusing stuff.

[hmetro24]

The first number indicates the viscosity of the oil at a cold temperature, while the second number indicates the viscosity at operating temperature

[EKVTIR-T]

I cant find the B18c7 specs right now but these are the FACTORY advised grades for the EK9 with B16B so its pretty much the same
As you can see,for Australian climate 50 is fine...

20 W - 40 - Recommended for climates -10 C to 15 C
20 W - 50 - Recommended for climates between -10 C to 40 C +
5 W - 40 - Recommended for climates between: -30 C or less to 40 C +
10 W - 40 - Recommended for climates between: -20 C to 40 C +
10 W - 30 - Recommended for climates between: -20 C to 30-35 C
5 W - 30 - Recommended for climates between: - 30 C or less to 0 C

[dc2r-0636]

awwwww shit

[Super-DA9]

there should be an oil discussion thread haha

ok so i'm guessing my view on the second number was a bit off after all, as thats 2 opinions matched against mine.

exactly what forums are for, sharing opinions and learning from it. (preferably not being offensive about it however :/ )

what i would still like to know is why 15w-50 will do "damage" to your engine? is it because it doesn't flow fast enough? on this subject, EKVTIR-T has stated that in the manual it says 50 is ok for our climate?

if flowing speed is an issue, shouldn't you just let your car warm up in the morning as hmetro24 stated earlier?

[anzai]

Regards,
Tom Cruise

[Super-DA9]

what? so we shouldn't warm our cars up? :S