Wonder To Put MotorCycle Oil Into Vehicle Car

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From Amsoil spec,
Motorcycle oil has higher (better number) than Vehicle car oil one.

MC to VC
VCC 40 : 152 to 123
VCC 100: 20,56 to 18,9
HTHS : 6,02 to 5
Flash Point : 240 to 233
Pour Point : -39 to -36
Noack Volatil : 3,89 to 6,5 (lower better)
4 Ball Wear Test : 0,37 to 0,40 (lower better)

So is it mean that MotorCycle oil better than Vehicle Car if we put in a Vehicle?

One thing to concern is,
Wet-Clutch Compatibility (JASO T 904:2006),
which MotorCycle oil has high friction index:
--------- Dynamic ---- Static Friction - Stop Time - JASO
---------Friction Index - - Index - - -------Index
AMSOIL ---- 2.07 --------- 1.95 ------- 1.98 -------- MA2

What Friction Index does to Vehicle Car Engine?
 
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You can use MC oil in a car, no problem. Most don't because it is usually a LOT more expensive that a comparable car oil.

Another reason not to is that MC oil is usually a 40 or 50-weight oil, and most cars don't call for that.
 
MC oil has no friction modifiers because they can interfere with wet clutches.

Auto oil often has friction modifiers to raise fuel efficiency.

So fuel efficiency might be lower when MC oil is used in a car engine.
 
I dont think Id do it. Id run an HDEO before a bike oil.

Any Amsoil would be a good choice.

Id wonder about the long term effects of running the wrong oil.
 
Like mentioned by addguy, MC oil is expensive and usually too heavy for cars.
The 'better' specs are valid, but totally unnecessary .
 
most people that are thinking of using a MC oil in there cars,do so because they are trying to raise the Phos. and Zn. levels as compared with many/most car oils. when they do,they sometimes add just 1 or 2 quarts or sometimes the entire fill,it depends.

MC oils tend to have less friction modifiers and therefor a lower friction index.this does exactly what it sounds like.the oil will have a slightly higher friction property between two moving parts.usually,but not always,it takes the form of simply having less moly or sometimes not at all.(purely to reduce the chance of the clutch slipping,which is a whole other story and a slight bit of misinformation,but not always).

some MCs also suffer from more heat,especially air-cooled ones.some MCs tend to get run really hard and then may sit for a whole week or more....so the formulators tend to make MC oils pretty stout,so i can definitely see the attraction to use it in a car.

if you want to use MC oil,for what ever reason,and your worried about the friction index,look for a bike oil with JASO MB rating and not JASO MA/MA2. the index will be better for your application,although the MA/MA2 rating,in and of itself only,will not cause harm to your car engine.

the truth is that the engine and transmission part of a MC would actually also benefit from a JASO MB rating,but with a wet sump,what are you going to do.....

there are other considerations though.do you have a warrenty or maybe need your cats to be effective longer.(this is also a point of debate). if you have cats,an API rating of SL may be a little better than SG. talk to the maker about Phos. and Zn. levels if you have cats.

...or use a car oil with what you want.they are out there.
 
Originally Posted By: priler

there are other considerations though.do you have a warrenty or maybe need your cats to be effective longer.(this is also a point of debate). if you have cats,an API rating of SL may be a little better than SG. talk to the maker about Phos. and Zn. levels if you have cats.

...or use a car oil with what you want.they are out there.


thanks for the reply.

wonder what does cats mean?
 
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