Is this a bad thing??

[BoBbOrAzE]

Hey, i just changed the oil on my gsx switching from 10w to 5w (it was verry low and very black) i also gave her some more coolant. Now i have noticed the the shifting has slightly changed, for one when i shift normal i can hear more of an airy whislte where as before it wasnt really anything. I cant really tell if its a better or worse feeling and im not sure why it would change. also last night i accidently hit the rev limiter for like the second time trying to pass someone dunno if that may have done something.
but it feels diffferent and i was wondering if anyone could explain to me maybe what affected it i kno its a hard question to answer

plus my idle is low as its always been, and constantly bouncing for 5 sec when i come to idle and then coming to a position (i will never find out why)

 

[1320Motorsports]

5w is too thin for these motors in my opinion, I never run less than 10w-30, usually 15-50

Matt

 

[BoBbOrAzE]

really, becuase i read on here from searching that 5w is fine. especially since its 10 degrees here in chicago

other people said that 10w was too much

 

[ChefTSI]

I dont know about your issues, but i have run 5w-30 threw mine from the day i got it ( 2 years ago) and it has never given me a problem.

 

[Defiant]

Yeh.

Meanwhile, oil and coolant have no connection with the gearbox.

 

[BoBbOrAzE]

no sorry i meant the shifting has changed in sound wise. its fine its just more airy sounding it could be anything. thanks for all the help

 

[jtmcinder]

While I hesitate to get involved in this thread, there is a possible explanation.

The thinner the oil, the less rotational friction in the engine. This would cause the engine to slow down slower when you lift for the shift (assuming the clutch pedal pressed). The slower the engine slows down, the more vacuum is maintained. The more vacuum that is maintained, the longer the CBV stays open. This longer the CBV stays open, the more you hear the characteristic sound of air moving through it.

And, no, I do not plan on defending this theory to the death. I post it mostly to show how clever and bored that I am.

- Jtoby

 

[Defiant]

Oh, yeah- and what's the second number on your viscosity?

 

[CyberEye]

I know people running 0w30 amsoil in their car with no problems.

 

[91limetsi]

The general rule for selecting your oil is to use the heaviest weight that is durable in the temperatures you will be driving in. If you look at the back of the bottle it will give you examples. Say if 5w-30 says good for -20 degrees to 70 degrees and 10w-30 is good for -10 degrees to 100 degrees and it is btween 0 and 5 degrees then 10w 30 would be your better choice because it will give you better protection. Those aren't the actual temperatures on the bottle but just look at what it says and use the heaviest for your temp range. If you drive like I do then you definitely don't want to rely on 5w-30.

 

[Defiant]

0W-30, 5W-30 and 10W-30 are all 30-weight oils. The difference is how they behave at 0°F, which is what the W is for- "winter". It's their flow characteristics at 0°, brought about by various additive packages.

So, what's the SECOND number on your oil?