Lets talk about Engine Oil - What Provides better protection during start up
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Lets talk about Engine Oil - What Provides better protection during start up
A great part of engine wear happens at startup, if you think otherwise, please start another thread or something.. post a link here if you like.
Oil gets thicker as the temperature go up, so polymers unwind in multi-viscosity oils, otherwise oil will get thinner. So that would mean oil has to be thick enough to protect at startup and thin enough to provide good flow..
Heres my question and example: Temperature is warm enough to run 10w30.. But would you still have better protection at startup with 5w30?
Heres what i think, 10w30 should provide better protection in this case because its thicker during cold start, temperatures are safe enough, so thicker oil base should lubricated and stick to parts more.. i would think.
On other hand, I'd like to understand more on what exactly makes 10w30 unsafe below certain temperature?
Oil gets thicker as the temperature go up, so polymers unwind in multi-viscosity oils, otherwise oil will get thinner. So that would mean oil has to be thick enough to protect at startup and thin enough to provide good flow..
Heres my question and example: Temperature is warm enough to run 10w30.. But would you still have better protection at startup with 5w30?
Heres what i think, 10w30 should provide better protection in this case because its thicker during cold start, temperatures are safe enough, so thicker oil base should lubricated and stick to parts more.. i would think.
On other hand, I'd like to understand more on what exactly makes 10w30 unsafe below certain temperature?
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From: OH
Re: Lets talk about Engine Oil - What Provides better protection during start up (vtec.dc2)
Kinda simple.
Thicker oil does not flow very well. Thinner oil does. So on startup on a cold motor, the thin oil will start flowing faster and build pressure quicker.
You ever tried to pour honey that came out of the refrigerator?
And yes, startup is the most important time to get oil flowing fast and into the head ASAP. SO you want thinner oil. That's why multi-weight was invented. You don't want straight 30 weight trying to reach critical parts of the motor on an engine that's been sitting overnight.
Thicker oil does not flow very well. Thinner oil does. So on startup on a cold motor, the thin oil will start flowing faster and build pressure quicker.
You ever tried to pour honey that came out of the refrigerator?
And yes, startup is the most important time to get oil flowing fast and into the head ASAP. SO you want thinner oil. That's why multi-weight was invented. You don't want straight 30 weight trying to reach critical parts of the motor on an engine that's been sitting overnight.
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From: canada
Re: Lets talk about Engine Oil - What Provides better protection during start up (vtec.dc2)
best thing for start up protection is a pre-luber. it pressurizes the oiling system with an external oil pump before you start up. so you never have a dry start up.
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Re: Lets talk about Engine Oil - What Provides better protection during start up (Steady)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Steady »</TD></TR><TR><TD CLASS="quote">best thing for start up protection is a pre-luber. it pressurizes the oiling system with an external oil pump before you start up. so you never have a dry start up.</TD></TR></TABLE>
where can you buy a pre-luber? how does it work exactly?
where can you buy a pre-luber? how does it work exactly?
I said I don't want a title!
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From: OH
Re: Lets talk about Engine Oil - What Provides better protection during start up (Razor)
Honestly, just run the proper weight oil and don't worry about it. Unless you have a goal of running 300K miles without tearing down the motor, I wouldn't lose sleep over startup wear.
Most Honda heads store a little oil to prevent wear on startup anyways.
Most Honda heads store a little oil to prevent wear on startup anyways.
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From: Bad Newz Kennels
Re: Lets talk about Engine Oil - What Provides better protection during start up (vtec.dc2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec.dc2 »</TD></TR><TR><TD CLASS="quote">Oil gets thicker as the temperature go up</TD></TR></TABLE>
this is a misconception when in reality the reverse is true. as the temperature increases a motor oil gets thinner. you can tell this by looking at the product data sheets for various oils.
for example:http://www.pennzoil-quakerstat...e.PDF
pennzoil 5w-30 has a viscosity of 60.0@40C, but when the temperature increases the viscosity decreases to 10.5cst@100C. thats a loss of 49.5cst when the temp. increases 60C. the only difference b/w the pennzoil 5w-30 and 10w-30 is that the 10w-30 has a viscosity of 67.0@40C so at start-up there is only a 7cst difference in viscosity at 40C. more viscosity improvers are used in the 5w-30 as supposed to the 10w-30 to acheive the lower viscosity at 40C. as everyone should know the more viscosity improvers a motor oil has the more prone it is to shearing.
this is a misconception when in reality the reverse is true. as the temperature increases a motor oil gets thinner. you can tell this by looking at the product data sheets for various oils.
for example:http://www.pennzoil-quakerstat...e.PDF
pennzoil 5w-30 has a viscosity of 60.0@40C, but when the temperature increases the viscosity decreases to 10.5cst@100C. thats a loss of 49.5cst when the temp. increases 60C. the only difference b/w the pennzoil 5w-30 and 10w-30 is that the 10w-30 has a viscosity of 67.0@40C so at start-up there is only a 7cst difference in viscosity at 40C. more viscosity improvers are used in the 5w-30 as supposed to the 10w-30 to acheive the lower viscosity at 40C. as everyone should know the more viscosity improvers a motor oil has the more prone it is to shearing.
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