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Old 06-02-2018, 10:41 PM   #1
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Oil weight

Ive read in owners manual for the ST that 5w30 is recommendes but 0w30 is also ok. Is the 0w30 mainly just for cold climate use, or is there any benefit in warmer climate also? Just curious of personal experiences


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Old 06-02-2018, 10:59 PM   #2
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Quote:
Originally Posted by hrphilipson View Post
Ive read in owners manual for the ST that 5w30 is recommendes but 0w30 is also ok. Is the 0w30 mainly just for cold climate use, or is there any benefit in warmer climate also? Just curious of personal experiences
For colder weather....I wouldn't run a 0 weight oil thou. Use a quality synthetic oil such as Mobil 1 5w-30.
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Old 06-03-2018, 07:58 AM   #3
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ANy start from ambient the zero weight will run a bit freer until the engine warms up. Then the oil is the normal 30 wt

You might see a very tiny improvement in mpg if you use the 0-30.
But I doubt you would notice it in the Summer.

I used Mobil One 0W30 once. I did not like the 'feel' right after the oil change. So next time I went back to The Mobil One performance 5W-30
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Old 06-03-2018, 11:00 PM   #4
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Old 06-04-2018, 10:44 AM   #5
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One needs to consider that the true base weight any oil begins at before adding any multi-vis additives is the lower number.

Meaning without additives a 0W-30 is actually a zero weight oil. Or, where the weight will swing toward if the oil gets used heavily enough to wear out the additives through time, what all oils do.

So, use the cold weight you need but nothing beyond that. Why I ran straight weights here in Texas for 30 years. They are truly the weight on the outside of the container.
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Old 07-24-2018, 03:46 PM   #6
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0W30 and 5W30 are BOTH 30 weight oils. They are going to perform the same. There's no harm running 0W30 the entire time. It's just extra additives to help with freezing weather. When it's -40F and you're trying to start your car, you'll WISH you had 0W30.
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Old 07-24-2018, 03:49 PM   #7
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Nope not how it works. amc49 is on the money.

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Old 07-24-2018, 03:51 PM   #8
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Uh, yep, that's how it works. The "W" stands for "Winter". And SAE 30 oil doesn't have those winter additives. I've been doing this stuff for 20 years and I've been on the phone with technical service departments of the oil companies discussing this.
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Old 07-24-2018, 03:54 PM   #9
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Not going to argue you're not worth the time I'll let AMC 49 school you. You have a lack of understanding when it comes to the base oil viscosity. The additives are to help it increases viscosity when it gets hot.

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Old 07-24-2018, 04:01 PM   #10
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You are 100% wrong. Use whatever oil you want. I am just trying to help people here understand. With 0W30 oils, it makes 5W30 and 10W30 oil obsolete. I don't know why they even bother making those other oils. You can never go wrong using 0W30 100% of the time. It performs well in hot or cold weather.
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