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Old 05-17-2013, 11:57 AM   #1
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20w50

Hello everybody,
I recently had all my fluids changed in my jeep, and my trusted mechanic used 20w50 for my engine oil. Now, I didn't think much of it at first because I heard this oil is good in the southern California heat. But recently I've noticed my jeep is having a slight lifter/valve tick in the mornings when the engine is cold. It goes away when the engine warms up. I never noticed this before I had my oil changed to 20w50.

Should I change back to 10w30(what I was using before)? Or am I worrying about nothing important?

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Old 05-17-2013, 12:02 PM   #2
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I wouldn't even THINK of running 20W-50, what kind of a nutcase is that mechanic? I'd run 5W-30 or 10W-30.

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Old 05-17-2013, 12:37 PM   #3
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...and my trusted mechanic used 20w50 for my engine oil.
You can trust him if you like. I would not.

What's wrong with trusting the manufacturer's specifications?
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Old 05-17-2013, 02:14 PM   #4
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Drain it and put in the right oil 5W or 10W 30
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Old 05-17-2013, 02:41 PM   #5
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It's just amazing how many people think they know more than the high paid automotive engineers that design our vehicles.
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Old 05-17-2013, 03:23 PM   #6
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I wouldn't even THINK of running 20W-50, what kind of a nutcase is that mechanic? I'd run 5W-30 or 10W-30.
Ive been a mechanic since i was 10 years old its what i do for a living ant i can honestly tell you that i would never run any kind of oil in my vehical outher than what was specified you want better oil for the heat? add a quart of lucas to your next service i personally run royal purple in all my gearboxes and the engine.. running the wrong viscosity oil you vehical CAN CAUSE DAMAGE and effect fuel economy beleave it or not
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Old 05-17-2013, 03:36 PM   #7
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What about 10w40 what would that do
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Old 05-17-2013, 03:54 PM   #8
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Using 5W30 here...
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Old 05-17-2013, 03:55 PM   #9
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Thanks for the response guys, changed back to 10w30
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Old 05-17-2013, 03:56 PM   #10
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Thanks for the response guys, changed back to 10w30
Just hope there is no permanent damage... How long did you use that type of oil (20W50)for?
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Old 05-17-2013, 04:01 PM   #11
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What about 10w40 what would that do
my understanding is the numbers like 10w40 describe the oils hot-cold viscosity (10 hot-40 cold) the different weight of oil are designed for different applications. the vehicle manufacture does alot of tests on vehicals before they are sold to the public so why not run the oil they suggest? not bash your mechanic but if the factory puts 10w30 in an engine you can bet your a** there is a reason lol. like i stated in my eariler post if you want a little moer protection from the heat where your from then simply add a quart of lucas oil additive the next time you service or use a full synthetic oil like royal purple. ( my grandpas powerstruggle just rolled over 300k miles royal purple is all its ever ran)
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Old 05-17-2013, 04:24 PM   #12
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Is there any benefit a side from more miles between changes and cost to use synthetic oil vs regular oil(5w30 ect) for someone who has a 10 year plus jeep?
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Old 05-17-2013, 04:25 PM   #13
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my understanding is the numbers like 10w40 describe the oils hot-cold viscosity (10 hot-40 cold)
10W-30 means it is a 10 weight viscosity when cold & 30 weight viscosity when warm. Trivia... the 'W' stands for Winter, not weight.
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Old 05-17-2013, 04:30 PM   #14
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10W-30 means it is a 10 weight viscosity when cold & 30 weight viscosity when warm. Trivia... the 'W' stands for Winter, not weight.
haha sorry for the typo didnt notice i had it backwards
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Old 05-17-2013, 04:35 PM   #15
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Is there any benefit a side from more miles between changes and cost to use synthetic oil vs regular oil(5w30 ect) for someone who has a 10 year plus jeep?
synthetic oil is better than conventional oil when it comes to the way it works. Conventional oil could never stand up to synthetic when it comes to longevity and ability to handle extreme high temperatures without breaking down
Synthetics have also been shown to produce less resistance in the engin which can offer more horsepower and overall efficiency for the engine.
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Old 05-17-2013, 04:35 PM   #16
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Alot of people run a slighty higher viscosity of oil in higher mileage vehicles and in areas with high temperatures such as Florida and So. Cal. Wont Hurt your engine unless you run into low temps where the oil will not flow properly, thats all the viscosity rating is a measurement of flow at a given temperature other than that the oil is the same lubrication wise.

Personaly I run Mobile 1 10w-30 in all my vehicles never a problem and both my Jeeps where bought new. Mobile 1 10w-30 went in them at the first oil change and has been in there since. 108,000 trouble free miles on my 03 and 57,000 trouble free on the 2010.
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Old 05-17-2013, 04:37 PM   #17
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Old 05-17-2013, 04:39 PM   #18
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Alot of people run a slighty higher viscosity of oil in higher mileage vehicles and in areas with high temperatures such as Florida and So. Cal. Wont Hurt your engine unless you run into low temps where the oil will not flow properly, thats all the viscosity rating is a measurement of flow at a given temperature other than that the oil is the same lubrication wise.
Thats what I would be worried about, running synthetic in my area. Winters here are absolutely brutal with extreme lows to reach -40c without the windshield factored in.
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Old 05-17-2013, 04:43 PM   #19
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Thanks for the link
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Old 05-17-2013, 04:50 PM   #20
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Winters here are absolutely brutal with extreme lows to reach -40c without the windshield factored in.
It's probably best to keep the windshield up during the winter. Heck, at -40c, I would keep the top up as well.
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Old 05-17-2013, 04:59 PM   #21
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Thats what I would be worried about, running synthetic in my area. Winters here are absolutely brutal with extreme lows to reach -40c without the windshield factored in.
Brrrrrrrrrrrr, I'm hoping you have a block heater on your Jeep!
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Old 05-17-2013, 05:32 PM   #22
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Brrrrrrrrrrrr, I'm hoping you have a block heater on your Jeep!
Oh its a prerequisite in my corner. Most vehicles up here don't start without it. Last winter, the passenger door wouldnt even open. Had to take it to my mechanic's garage and leave it inside overnight just to thaw the damn thing.
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Old 05-17-2013, 05:32 PM   #23
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It's probably best to keep the windshield up during the winter. Heck, at -40c, I would keep the top up as well.
Haha.....
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Old 05-17-2013, 05:36 PM   #24
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It's probably best to keep the windshield up during the winter. Heck, at -40c, I would keep the top up as well.
Smooth one...
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Old 05-17-2013, 05:49 PM   #25
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Originally Posted by pineda22 View Post
my understanding is the numbers like 10w40 describe the oils hot-cold viscosity (10 hot-40 cold) the different weight of oil are designed for different applications. the vehicle manufacture does alot of tests on vehicals before they are sold to the public so why not run the oil they suggest? not bash your mechanic but if the factory puts 10w30 in an engine you can bet your a** there is a reason lol. like i stated in my eariler post if you want a little moer protection from the heat where your from then simply add a quart of lucas oil additive the next time you service or use a full synthetic oil like royal purple. ( my grandpas powerstruggle just rolled over 300k miles royal purple is all its ever ran)
That is not accurate. Viscosity is measured at 100 degrees centigrade. From the motor oil bible:

"The first number (the "5" in 5w30) is only a relative number which basically indicates how easily it will allow an engine to "turn over" at low temperatures. It is NOT a viscosity reference. In other words, a 10w30 is NOT a 10 weight oil in cold temperatures and a 30 weight oil in warm temperatures.

In fact, since SAE viscosity classifications only apply to an oil at 100 degrees C, it doesn't even make sense to label it as a certain SAE viscosity at any temperature other than 100 degrees C.Besides, if you thought about it for a second, it wouldn't make sense for a 10w30 oil to be a 10 weight oil in the cold and a 30 weight oil in warm temperatures. What liquid do you know of that gets "thicker"
as its temperature increases or "thinner" as the temperature decreases?"

Here is more than you ever wanted to know about motor oil:

http://hyperformancecycles.net/oil_bible.pdf

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Old 05-17-2013, 06:36 PM   #26
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That is not accurate. Viscosity is measured at 100 degrees centigrade. From the motor oil bible:

http://hyperformancecycles.net/oil_bible.pdf
how dare you sir! perhaps this will help my explination as you are correct...kind of haha (no offence ment searously all in good fun) after reading my erlier post i realized i should have simply posted this

When you see a W on a viscosity rating it means that this oil viscosity has been tested at a Colder temperature. The numbers without the W are all tested at 210° F or 100° C which is considered an approximation of engine operating temperature. In other words, a SAE 30 motor oil is the same viscosity as a 10w-30 or 5W-30 at 210° (100° C). The difference is when the viscosity is tested at a much colder temperature. For example, a 5W-30 motor oil performs like a SAE 5 motor oil would perform at the cold temperature specified, but still has the SAE 30 viscosity at 210° F (100° C) which is engine operating temperature. This allows the engine to get quick oil flow when it is started cold verses dry running until lubricant either warms up sufficiently or is finally forced through the engine oil system. The advantages of a low W viscosity number is obvious. The quicker the oil flows cold, the less dry running. Less dry running means much less engine wear.

Obviously, cold temperature or W ratings are tested differently than regular SAE viscosity ratings. Simply put, these tests are done with a different temperature system. There is a scale for the W, or winter viscosity grades and, depending on which grade is selected, testing is done at different temperatures.

exerpt from Motor Oil Viscosity Grades Explained in Layman's Terms check it out
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Old 05-17-2013, 08:27 PM   #27
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Stop trusting your mechanic......
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Old 05-17-2013, 11:15 PM   #28
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That is not accurate. Viscosity is measured at 100 degrees centigrade. From the motor oil bible:

"The first number (the "5" in 5w30) is only a relative number which basically indicates how easily it will allow an engine to "turn over" at low temperatures. It is NOT a viscosity reference. In other words, a 10w30 is NOT a 10 weight oil in cold temperatures and a 30 weight oil in warm temperatures.

In fact, since SAE viscosity classifications only apply to an oil at 100 degrees C, it doesn't even make sense to label it as a certain SAE viscosity at any temperature other than 100 degrees C.Besides, if you thought about it for a second, it wouldn't make sense for a 10w30 oil to be a 10w weight oil in the cold and a 30 weight oil in warm temperatures. What liquid do you know of that gets "thicker"
as its temperature increases or "thinner" as the temperature decreases?"

Here is more than you ever wanted to know about motor oil:

http://hyperformancecycles.net/oil_bible.pdf

Your source is wrong because the first number is a reference to the viscosity measured at a lower temperature. Your also incorrect in that oil viscosity is measured at both 100 C and 40 C. A 10W-30 means it has the viscosity of a "10w" at 40 C and viscosity if a 30 weight at 100 C. Multi weight oils are simply oils chemically engineered to have smaller viscosity differentials based on temperature. The W numbers are just made up, they are just relative references to the viscosity of the oil at a lower temperature.

Some charts

Viscosity Charts - Bob is the Oil Guy

More than anyone could ever want to know about oil

Putting the Simple Back into Viscosity - Bob is the Oil Guy
Motor Oil 101 - Bob is the Oil Guy
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Old 05-17-2013, 11:36 PM   #29
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Hello everybody,
I recently had all my fluids changed in my jeep, and my trusted mechanic used 20w50 for my engine oil. Now, I didn't think much of it at first because I heard this oil is good in the southern California heat. But recently I've noticed my jeep is having a slight lifter/valve tick in the mornings when the engine is cold. It goes away when the engine warms up. I never noticed this before I had my oil changed to 20w50.

Should I change back to 10w30(what I was using before)? Or am I worrying about nothing important?
That would be oil starvation on cold starts...it's not life altering but i'd switch back to 5w30 or 10w30 like the others suggested.

Did your mechanic say why he used 20w50?
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Old 05-18-2013, 01:25 AM   #30
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[QUOTE=freeskier;3767290]Your source is wrong because the first number is a reference to the viscosity measured at a lower temperature. Your also incorrect in that oil viscosity is measured at both 100 C and 40 C. UNQUOTE]

Hey don't blame me for the info. Maybe these guys should argue it out between themselves, but I would take the Bible over Bob. How can you argue with the word of the Almighty?

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