quote:
Originally posted by Gary Allan:
This link has the real fat, skinny, and the moxie to do it for you Buford!No!! This guy has all of Buford's answers ...for real!
quote:
Originally posted by Gary Allan:
This link has the real fat, skinny, and the moxie to do it for you Buford!No!! This guy has all of Buford's answers ...for real!
I never caught that obvious mistake. I meant that the W stands for WINTER. My bad.quote:
Originally posted by Buford T. Justice:
Bryanccfshr: Good info.
Triple_Se7en: Good point, but it might be clsoe. I have never seen 5W-40 poured, etc.
Rodbuckler: I am tempted to try it, but it sounds to me like it will burn oil. I guess our engines are too accustomed to 5W-30.
BlazerLT: Yes I know the W stands for weight, but it is still 5W weight meaning 5 winter weight right?
Ah, ok, that's cool.quote:
Originally posted by Buford T. Justice:
I never caught that obvious mistake. I meant that the W stands for WINTER. My bad.quote:
Originally posted by Buford T. Justice:
Bryanccfshr: Good info.
Triple_Se7en: Good point, but it might be clsoe. I have never seen 5W-40 poured, etc.
Rodbuckler: I am tempted to try it, but it sounds to me like it will burn oil. I guess our engines are too accustomed to 5W-30.
BlazerLT: Yes I know the W stands for weight, but it is still 5W weight meaning 5 winter weight right?
How can 5w-20 offer better protection than a 5w-30?quote:
Originally posted by Buford T. Justice:
I think the point I have been trying to elude to is that I wonder why 5W-20 is now becoming the norm. Meaning isn't 5W-30 superb for today's cars? Meaning 5W-30 is pretty thin when hot and offers the same cold protection since both are 5W. In other words, how can a thinner version (5W-20) of an oil that is already pretty thin (5W-30) be any better?
No, Blazer, all oil thins when hot. But multi oils thin differently than straight. When that hot 200 degree oil comes out of your engine it's of course thinner than room temp 5 weight... But it's thicker than 200 degree 5 weight. In fact, it's about as thick as 200 degree 30 weight. =)quote:
Originally posted by BlazerLT:
lol, so oil thickens when it gets hot.quote:
Originally posted by sinker73:
5W-20 and 5W-30 are both the same viscosity at room temp. They both start with the same base oil--what we designate 5W. The additives that turn it into a 20 or 30 only do so at warmer temps. The additives are little (plastic like) molecules that "unstretch" at warmer temps. When they do so, they "grab" the nearby oil molecules (which are smaller) and thus "thicken" the oil. (BTW, "shearing" is when these large molecules break and no longer "grab" the smaller oil molecules.)
At room temp, when the plastic-like molecules are not spread out, the oils from a can of 5-20 and 5-30 should run the same.
That is weird, when I drain my oil out of my hot engine it is like water compared to what it is out of the bottle at room temp.
Ignorance is thick with the new guys.
I never said at what temp 5W is designated. It doesn't matter. It's a standard. 5W is the same oil whether we are at -40 or 110 degrees.quote:
Originally posted by TomJones76:
Room temp isn't where the "5W" is calibrated.quote:
Originally posted by sinker73:
5W-20 and 5W-30 are both the same viscosity at room temp. They both start with the same base oil--what we designate 5W. The additives that turn it into a 20 or 30 only do so at warmer temps. The additives are little (plastic like) molecules that "unstretch" at warmer temps. When they do so, they "grab" the nearby oil molecules (which are smaller) and thus "thicken" the oil. (BTW, "shearing" is when these large molecules break and no longer "grab" the smaller oil molecules.)
At room temp, when the plastic-like molecules are not spread out, the oils from a can of 5-20 and 5-30 should run the same.
The 5W refers to oil properties at -25 F or so.
Also, the base oil is NOT usually 5W.
It would be typical for a 5W30 to be a 10W or 20W, then have pour point depressants added to improve starting, and have more additives put in to improve its viscosity index and make the "30" part accurate.
Vote to Ban!quote:
Originally posted by Buford T. Justice:
In other words, how can a thinner version (5W-20) of an oil that is already pretty thin (5W-30) be any better?
One more thing in regards to CAFE. If it is being mandated for vehicle manufacturers to use 5W-20 or not they pay fines, why does GM and numerous other vehicles still use 5W-30?
You feeling OK?quote:
Originally posted by Auto-Union:
Vote to Ban!quote:
Originally posted by Buford T. Justice:
In other words, how can a thinner version (5W-20) of an oil that is already pretty thin (5W-30) be any better?
One more thing in regards to CAFE. If it is being mandated for vehicle manufacturers to use 5W-20 or not they pay fines, why does GM and numerous other vehicles still use 5W-30?
I'm not an "oil guy" I'm a motor guy and want to correct some miss statements here on this thread that are not correct.quote:
Originally posted by Buford T. Justice:
3) My oil pressure gauge goes straight to the recommended pressure on start up which to me means that the oil is on the critical parts that wear down at start up when no oil is on them. It is instantaneous. There is no delay.
4) Thicker oils quiet engines. Engines will wear down no matter what. The thickest oil you can safely run (comparing 5W-20 to 5W-30) should be used.
I appreciate your post. I believe my car would probably be OK with 5W-20, but when the car was built the oil recommended was 5W-30 all year or 10W-30 for the summer. It has always used 5W-30 with no problems whatsoever.quote:
Originally posted by BuzzCut:
I'm not an "oil guy" I'm a motor guy and want to correct some miss statements here on this thread that are not correct.
First off the 4.6 Will run on the "revised" oil just fine without oil burning. My 95 with the modular has 120K and does just fine.
Secondly, Buford, you do know your "oil pressure" gauge is nothing but an "idiot" gauge? It shows the same reading for 6 psi or 60 psi. And just because the sender has pressure it doesn't mean the cam caps have it yet. I can also bet the engine has a good rattle on start-up as the timing chain tensioners probably bleed off. It takes a little longer to quiet with the heaver oil. That can be hard on parts.
Thicker oils quiets them and also starves them of proper lubrication on cold start-up. You can believe what you want but running that oil in a 4.6 isn't needed.
quote:
Originally posted by Buford T. Justice:
You feeling OK?quote:
Originally posted by Auto-Union:
Vote to Ban!quote:
Originally posted by Buford T. Justice:
In other words, how can a thinner version (5W-20) of an oil that is already pretty thin (5W-30) be any better?
>>
One more thing in regards to CAFE. If it is being mandated for vehicle manufacturers to use 5W-20 or not they pay fines, why does GM and numerous other vehicles still use 5W-30?
>>
I find this suspect. An "idiot light" comes on when the oil is low. If not low, it is off. How can my oil gauge then be on all the time when the car is running? I would think the needle would go lower if the oil is going low. But my car burns nor leaks any oil so I can't say.quote:
Originally posted by Gary Allan:
Buford. What he says is true. Your gauge will read the same regardless of the pressure ..as long as it has pressure. It's a light with a needle for an indicator. It may change slightly due to the change in resistance of the wire as it warms.
It has two states ...no reading ..and where ever it ends up with current going through it. It's blind and numb/dumb.
(visions of Young Frankenstein "Was this a NORMAL brain?" "Yes" "...what kind of NORMAL?" "AbbyNormal")