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Old 05-15-2019, 05:22 AM   #1
StarLady
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Default Switch from 5w30 to 10w30?

It has just occurred to me... since I now live in a much warmer climate, and my car is "older" Would it be a good idea to start using 10w30 oil?
What would be the pros and cons?

...
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Last edited by StarLady; 05-15-2019 at 05:24 AM.. Reason: spelling error

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Old 05-15-2019, 06:16 AM   #2
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Default Re: Switch from 5w30 to 10w30?

I just came across this post from 2010:

" I like 10w better simply because it has fewer of the exotic and fragile "viscosity index improver" compounds in it. Those chemicals help dino achieve the spread between the 5 and the 30 in 5w30 and 5w30 needs more than 10w30 (all else equal). Less is better in a Saturn because when oil gets trapped between our oil control rings and compression rings that stuff is the first thing to overheat and burn off into sludge. And you know what happens next: oil consumption!"
http://www.saturnfans.com/forums/sho...d.php?t=150880

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Old 05-15-2019, 06:28 AM   #3
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Default Re: Switch from 5w30 to 10w30?

I run 10w-30 in the hot SC Summer. Engine sounds slightly more "copacetic" & less "raw".

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Old 05-15-2019, 06:52 AM   #4
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Default Re: Switch from 5w30 to 10w30?

I ran nothing but 5W-30. During the rebuild at 204K, the engine looked really good inside. Had there been drain back holes in the pistons I probably would not have been rebuilding.

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Old 05-15-2019, 04:17 PM   #5
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Default Re: Switch from 5w30 to 10w30?

Quote:
Originally Posted by Pitcher View Post
I run 10w-30 in the hot SC Summer. Engine sounds slightly more "copacetic" & less "raw".
I had to look that word up Thanks. I love learning new words.

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Old 05-15-2019, 04:52 PM   #6
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Default Re: Switch from 5w30 to 10w30?

'Copacetic' was termed in the '20s' so its not a new word. Its a leftover from a bygone era, resurrected to make something old, new. Sort of like using old school phrases like 'public relations' and inventing a new way to put a spin on this phrase - spin doctoring. F!@% is used as an adjective "WTF?!", a verb "F--- off!?, noun "Well, he's a f---", etc. The last time copacetic was used was WW II and afterwards but fell into disuse as new words came to replace it; cool, mojo, bad (as in good), etc. Look to the past to see how many things old are suddenly new to the next generation.

Asking about oil is opening a new page in oil debates with as many opinions along with rumors and bad advice from the uninformed. The oil companies are more than happy to indulge in every form of oil to cater to the billions of 'ice' cars around the world. Regular oil comes in single or multiple viscosities, 100% synthetic or mixed blends of regular and synthetic at every price level. About the only thing to remember besides recommended viscosities is staying with standardized ratings. And even that can be confusing; http://www.pqiamerica.com/apiserviceclass.htm. About the only precaution is buying oil labeled from places like "Harry's Bait and Tackle".....

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Old 05-15-2019, 07:15 PM   #7
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Default Re: Switch from 5w30 to 10w30?

Quote:
Originally Posted by fdryer View Post
'Copacetic' was termed in the '20s' so its not a new word. Its a leftover from a bygone era, resurrected to make something old, new.
Just new to me

I didn't mean to start yet another big debate about motor oil. Just wondered if there might be a good reason to not start using 10w30 in my car. But I've been doing some reading of old threads here, and it would seem that there's no problem, and may even be a good thing for my old Satty here in warm Hawaii.

...
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Old 05-15-2019, 07:34 PM   #8
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Default Re: Switch from 5w30 to 10w30?

There is no technical reason to switch to a 10w-30 oil. The cold start and normal running viscosity of either 5w-30 or 10w-30 will be functionally identical. You would be bet off using a good 100% PAO synthetic other than that stay with the 5w-30 you have been using.

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Old 05-15-2019, 10:26 PM   #9
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Default Re: Switch from 5w30 to 10w30?

Quote:
Oil pressure itself does not directly prevent engine wear. Oil pressure is only a measure of resistance to flow. So, it does not help an engine at all, to use super thick oil in order to increase the oil pressure. But, knowing that your engine makes sufficient HOT oil pressure is essential. Because that tells us if the oiling system is robust enough to keep up with the oil bleed-off out of the bearing clearances, in order to maintain that critical incompressible hydrodynamic liquid oil wedge between the bearings and crankshaft journals. So, even though oil pressure by itself does not directly help prevent wear, knowing that the oil pressure is acceptable, is extremely important.

In general, it is best to use the thinnest viscosity motor oil that will still maintain sufficient HOT oil pressure. Thinner oil is best because thinner oil flows, lubricates and cools critical engine components better than thicker oils can. Thinner oils reduce bearing temperatures and sump temperatures compared to thicker oils. Thinner oils can also help increase horsepower and miles per gallon. Using thicker oil than is needed, is going the wrong way. See my Blog’s “Section 2” on motor oil viscosity selection, and the benefits of using thinner oil, for all the details.
This is a resource I found....

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Old 05-15-2019, 10:28 PM   #10
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Default Re: Switch from 5w30 to 10w30?

Quote:
Which Motor Oil is best, 5W30 or 10W30?

5W30 is almost ALWAYS the better choice. Here’s why:

Both oils are rated as 30wt oils when at normal HOT operating temperature. So, they are equivalent where an engine spends 99% of its life.

But, 5W30 is rated as a 5wt oil when cold, where 10W30 is rated as a 10wt oil when cold. That means 5W30 will flow better, and thus lubricate better, during cold engine start-up and during engine warm-up, when the colder and thicker oil is not flowing as freely as when it is fully warmed up. The cold flow advantage of 5W30 is ideal, and highly desirable. So, there is absolutely no benefit to using 10W30 in most engines.

However, the only exception is for those few engines out there that may make bothersome cold start-up noise with 5W30, that can be eliminated with 10W30. Other than that purpose, there is no good reason for anyone to ever use 10W30.
And another resource from 540RAT.

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Old 05-16-2019, 04:16 AM   #11
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Default Re: Switch from 5w30 to 10w30?

Thanks everyone for the helpful input.
I guess, "if it aint broke, don't fix it."

...
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Bought it brand new, and still loving it today.

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Old 05-16-2019, 11:27 AM   #12
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Default Re: Switch from 5w30 to 10w30?

My owner's manuals (1998, 2001, 2001) all say 5w30 is the recommended oil weight, but if ambient temps will remain above 20F, 10w30 is fine, too.
Pretty sure most of Hawaii is normally above 20F

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Old 05-17-2019, 02:11 AM   #13
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Default Re: Switch from 5w30 to 10w30?

Remember why multi grade was made...people want to start and go in 5 seconds or less.
If you idle 30 s or more before moving the car when starting from cold engine ...then no difference between 5W and 10W
But if you are always 2 minutes late in the morning stick to what is recommended

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Old 05-17-2019, 08:22 AM   #14
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Default Re: Switch from 5w30 to 10w30?

Quote:
Originally Posted by alordofchaos View Post
My owner's manuals (1998, 2001, 2001) all say 5w30 is the recommended oil weight, but if ambient temps will remain above 20F, 10w30 is fine, too.
Pretty sure most of Hawaii is normally above 20F
The oil recommendations in any Saturn owners manual is at least 17 years out of date. That renders those recommendations For Information Only.

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Old 05-17-2019, 08:44 AM   #15
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Default Re: Switch from 5w30 to 10w30?

why not switch to a thicker in the heat weight like a 5w-40 or a 10w-40. Basically what I am asking is... isn't the top/high number more about the hot end of the spectrum?

...and please, I hope we are all talking about Full Synthetic Oil. If anyone is demonstrating any concern as to what's the best oil to put in a car they love and depend on, it should always be full synthetic.

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Old 05-17-2019, 09:26 AM   #16
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Default Re: Switch from 5w30 to 10w30?

It is not hot enough there to justify any 40 weight oil in these engines. A large percentage of the engine cooling is performed by the oil. Increasing viscosity will increase the internal oil temperature and heat load on the liquid cooling system. The higher viscosity reduces the oil flow rate and increases the indicated pressure. The decreased flow rate is a very bad thing to have happen.

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Old 05-17-2019, 12:41 PM   #17
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Default Re: Switch from 5w30 to 10w30?

How about 0w30? I've been using it for 4 years with no noticeable change in oil consumption compared to the 5w30 I used previously.

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Old 05-17-2019, 06:22 PM   #18
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Default Re: Switch from 5w30 to 10w30?

The Xw in the product ID has to do with the 32F viscosity and has nothing to do with the normal viscosity at 40C and 100C. The viscosity index gives you a clue as to the viscosity at the normal cold start temps. Using the 0w-30 is not going to hurt anything unless you are buying a low quality synthetic or mineral based oil then you may run into a excessively low viscosity condition at hot operating temperature.

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Old 05-21-2019, 01:33 PM   #19
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Default Re: Switch from 5w30 to 10w30?

Quote:
Originally Posted by StarLady View Post
It has just occurred to me... since I now live in a much warmer climate, and my car is "older" Would it be a good idea to start using 10w30 oil?
What would be the pros and cons?
Either would be fine in your location (between those two choices, I'd pick 10w myself). As others have said, using Full Synthetic is a better choice than non-synthetic. And I'll throw in that using a "High Mileage" oil will (typically) give you a better additive package at no additional expense.

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Old 05-21-2019, 04:23 PM   #20
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Default Re: Switch from 5w30 to 10w30?

Thanks everyone for your helpful input. Will keep the info in mind, along with other info posted on older threads I've been reading here.
At this time I'm not ready to make the jump to synthetic or high mileage oils. That would be too drastic of a change for me (and my Satty). Baby steps.

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