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Old 11-09-2001, 07:50 PM   #1
sidewayz
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Default anybody try Mobil1 0w-30??

Dude YEAH!!!! this oil kicks ass....anyone else try it?
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Old 11-10-2001, 02:58 PM   #2
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I've been running Mobil1 10W30 in the summer and 5W30 in the winter, but AutoZone was out of the 5W30 half-cases this time, so I'm running the 0W30 stuff currently. Thinner oil is supposed to be better for fuel economy and give a tiny bit amount more horsepower (due to less resistance, though possibly at a wear tradeoff).

Shane -- http://www.warpthree.net
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Old 11-10-2001, 03:00 PM   #3
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I run 15w-50 in the summer (Phoenix) and 10w-40 in the winter. The zero weight oil is good but it will cause premature wear in your engine.

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Old 11-10-2001, 10:28 PM   #4
Richard L.
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Quote:
Originally posted by Imprezinator
The zero weight oil is good but it will cause premature wear in your engine.
Could you go into details on why zero weight oil will cause premature wear in the engine?

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Old 11-10-2001, 10:35 PM   #5
Eric SS
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The higher the weight, the more viscous it is. The lower the weight, the thinner it is.Thinner oil will not protect parts as good as thicker oil. I'm not talking about extremely quick wear, but over time, you will get more ware, especially on the valvetrain where there is not a very thick sheet of oil between things anyway.

I can;t go into detail because I don;t know all the elements about it but if you search on the web, you will find some good stuff

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Old 11-10-2001, 11:27 PM   #6
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which is exactly why i run 10w-40

i've read quite a bit about it actually, and its really simple.. thinner oil has less friction, but the protective layer between moving parts is closer, there is some really big techinical term for it, and thicker oil has a thicker layer of protection or tolerance between parts..
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Old 11-11-2001, 02:24 AM   #7
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We are not talking about straight 0 weight oil here. We are talking about multi viscosity 0W-30 motor oil. A 0W-30 oil will flow like straight 0 weight oil when cold and will not thin more than a straight 30 weight oil would when hot. Are you willing to trade wear at operating temp. for more wear at cold start up by using thicker viscosity oil?

As for using 10w-40 dino oil, you might want to check out this page:
http://www.vtr.org/maintain/oil-overview.html

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Old 11-11-2001, 04:00 AM   #8
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no, there will always be more wear with a thinner oil in any situation, because there is less suspension between the parts, and the thinner oil may occasionaly allow the parts to touch causing premature wear..
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Old 11-11-2001, 04:14 AM   #9
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i didn't read that article, but i bet it talks about 10w-40 having more pollys because of its wide point spread.. this does cause the oil to break down faster than a oil with smaller spread, but this is only measurable in a controlled situation and the difference negligible..
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Old 11-11-2001, 10:41 AM   #10
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i had a chance to read the article, and by what it says, 0w-30 has the same spread as 10w-40, so you might run the risk of voiding your cars warranty.. so it would be just as bad, no where does the article say 0w-30 is better..

at the end of the article they state the approximate range before oil breaks down, and how its wise to change your oil every 3000 miles to avoid viscosity breakdown, which makes all the tests they ran irrelevant.. tests that may matter, are tests that test the pressure a film of oil can withstand before it will allow the two surfaces of to contact, and tests of shearing force.. neither did they run.. thicker oils by better brands will be better.. by the results of the what the tests in the article say, you should run Chevron oil.. but like i was saying tests of viscosity don't matter unless you run your oil for 10,000 miles..
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Old 11-12-2001, 03:58 AM   #11
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ryan this was brought up in the tranny forum ...do a search there you might find some more helpful posts
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Old 11-12-2001, 10:45 AM   #12
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Richard L is right. The only time 0W30 oil is "thinner" than 5W30 oil is when it's cold. All the specs for the first number ("0W", "5W") are _maximum_ viscosity specs. However all the specs for the second number ("30"), are _minimum_ viscosity specs. IE, 0W30 doesn't get any less viscous than 5W30 when hot.

If you do a web search on "SAE J300" you will find all you wanted to know and more.

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Old 11-13-2001, 01:36 AM   #13
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I think there's also a danger in running oil that is too heavy. If the oil is too thick, it may not flow well through some of the smaller passages and tighter clearance areas.

Over time with a heavy oil you may get certain parts that show abnormal wear from a lack of oil.

so, running 50weight to quiet down the valves is probably not a good idea, unless you're selling the car, and then packing the valve covers full with ground hamburger or bananas works much better
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Old 11-13-2001, 01:46 AM   #14
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Quote:
Originally posted by micahb
Richard L is right. The only time 0W30 oil is "thinner" than 5W30 oil is when it's cold. All the specs for the first number ("0W", "5W") are _maximum_ viscosity specs. However all the specs for the second number ("30"), are _minimum_ viscosity specs. IE, 0W30 doesn't get any less viscous than 5W30 when hot.

If you do a web search on "SAE J300" you will find all you wanted to know and more.

cheers
mbs
True but most of the ware that occurs on an engine happens during startup and when the engine is cold.

Thicker oil will tend to stay in areas that it is supposed to be in when the car is parked. Thinner oil will pool in the oil pan quicker. Therefor, when the oil is cold is when you need it the most (to a point).

If it were the case that 0w-30 was the pretty much the same as 10w-30, why doesn't everyone run it if it is so good? because it WILL cause more wear during the most crucial time your engine needs lubrication. That's not to say that an engine doesn;t need lubrication all the time. But if both oils heat up to the "30", why start with thinner oil?? It wouldn;t make sense to do so under any circumstances

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Old 11-13-2001, 01:48 AM   #15
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Quote:
Originally posted by Joelk
I think there's also a danger in running oil that is too heavy. If the oil is too thick, it may not flow well through some of the smaller passages and tighter clearance areas.

Over time with a heavy oil you may get certain parts that show abnormal wear from a lack of oil.

so, running 50weight to quiet down the valves is probably not a good idea, unless you're selling the car, and then packing the valve covers full with ground hamburger or bananas works much better
I would much rather run thicker oil than thinner. I run Mobil 1 15w-50 in the summer and move down to 10w-40 in the winter.

Eric
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Old 11-13-2001, 02:11 AM   #16
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i don't think there is any way thicker oil can possibley harm the motor.. you may gain better slightly better mileage and maybe even a little extra power from thinner oil, but thicker oil will always provide better protection..
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Old 11-13-2001, 03:04 AM   #17
Richard L.
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Quote:
Originally posted by Imprezinator
True but most of the ware that occurs on an engine happens during startup and when the engine is cold.

Thicker oil will tend to stay in areas that it is supposed to be in when the car is parked. Thinner oil will pool in the oil pan quicker. Therefor, when the oil is cold is when you need it the most (to a point).
So are you saying that thicker oil provides better protection at start up than thinner oil? If that's the case, why not use straight 30 or 40 weight oil all year round?

Yes, most of the wear happens during start up. Therefore, you would need thinner oil to provide vital lubrication to moving parts inside the engine during the first two or three seconds after start up because thinner oil flows faster and easier than thicker oil during that period of time.

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Old 11-13-2001, 03:15 AM   #18
Eric SS
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Quote:
Originally posted by Richard L.

So are you saying that thicker oil provides better protection at start up than thinner oil? If that's the case, why not use straight 30 or 40 weight oil all year round?
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That's exactly what I am saying. Think about it this way.

Put water on a 45 degree angle and put syrup on the same angle. Water will run off the angle a lot quicker than the syrup will. The same thing happens in an engine. The thicker oil stays where it is supposed to be more than thinner oil does. Now the difference between thin oil and thicker oil is not as drastic as water and syrup but the same princile applies.

Have you ever seen prelube for an engine? Pre-lube is what you put on all the bearings, cylinder walls, and all over the valvetrain when you are rebuilding an engine. BVasically you put it everywhere tht oil goes in a normally operatiing engine. This stuff is EXTREMLY thick. Thicker even than Manual transmission gear oil. The reason that it is so thick is because you want the engine to be as well lubricated when you start it as possible and when you rebuild an engine, there is a chance that it will not be started for weeks.

If you have ever taken an engine apart and tried to spin the cam (without the rest of the valvetrain) or crankshaft (without pistons and rods), Even 15w-50 oil spins extremly easy. THE ONLY adverse effects of thicker oil are a little worse gas milage and a little power loss. Hope this cleasrs things up a little

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Old 11-13-2001, 03:37 AM   #19
Richard L.
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Hmm. Okay. You can go ahead and use thick oil, even in cold winter months (when temperatures may dip below freezing), since thick oil will provide lubrication for you. I see that you use 10w-40 in the winter. Since 10w-40 is pretty thin when it's cold, why not use something thicker, like straight 40 weight oil, in the winter?

I will stick with 10W-30 all year round

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Old 11-13-2001, 03:38 AM   #20
Eric SS
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Because I live in Phoenix believe it or not, it can start out around 30 degrees in the morning and work its way up to 70 in the middle of the day during winter

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