5w30 vs 10w30 - JeepForum.com
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post #1 of 18 Old 09-14-2012, 09:20 AM Thread Starter
stormer1092
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5w30 vs 10w30

Well for the last few years ive been running 10w30 year round but its loud when i start it up when its close to 0 degrees around here. I was thinking of switching to 5w30 in the winter just to get rid of this problem and get better protection on start up. My 4.0 has 212,000 miles on it also would this effect anything?

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post #2 of 18 Old 09-14-2012, 10:02 AM
PolkaPower
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They are both the same operating temp weight. Some people here run the Shell 5w 30 and like it a lot. Rotella I think.
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post #3 of 18 Old 09-14-2012, 10:56 AM
02Lightning
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I don't even think a 0w30 would hurt anything. After the oil is warm they are the same weight, the first number is the weight when cold.

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 119,500 miles
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post #4 of 18 Old 09-14-2012, 11:02 AM
PolkaPower
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I have read that the only thing is that they have more viscosity additive packs that can wear out sooner than a 10w 30 so you should change it more often. That might not be true anymore though.
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post #5 of 18 Old 09-14-2012, 12:06 PM
Cdy291
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Basically you have a 0w, 5w, or 10w oil that is loaded up with stuff that makes it thicken when hot, all go a so called 30w. Even new oil though can vary a bit. Some companies 30w may be a 33, while another may be a 29. Then it shears down with use. The 10w should shear less but be harder for a modern engine to start on, not a concern for any ZJ engine.

Pennzoil Syn 5w20 is in reality thinner than Mobile Syn 0w20.
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post #6 of 18 Old 09-14-2012, 12:19 PM
PolkaPower
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I was reading that Shell Rotella is on the thicker side compared to other oils in the same weight.
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post #7 of 18 Old 09-14-2012, 02:45 PM
Kevinyj95
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I run 5w30 in the winter and 10w40 in the spring/summer/fall. I use lucas oil brand. Doesnt break down like the others. Before that I used pens. Never tried rotella. But everything else Ive tried has been junk. Either it breaks down burns to easy etc. I dont like my oil to be black when I change it at 3500 miles or 4000 mile. I like it to look a little worn down but not like coffee. Ive wanted to try royal purple. But Lucas is a habbit forming. As for miles a few years ago my odometer stopped working at 281k The engines been rebuilt and I maintain it. Its a 5.2 not a 4.0 though. But Ive seen 4.0s with 300k. Most of the time the engines die when the owner neglects to maintain the vehicle and after the bearing clearences start to gap you lose oil pressure when she gets warm. Wears down things fast. Always change your bearings in a rebuild. Some of the stealerships change the gaskets and call it a rebuild. How ignorant is that? Sorry I went on a rant.
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post #8 of 18 Old 09-14-2012, 02:48 PM
Robert_Beers
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Quote:
Originally Posted by PolkaPower View Post
I have read that the only thing is that they have more viscosity additive packs that can wear out sooner than a 10w 30 so you should change it more often. That might not be true anymore though.
Actually the opposite is true. The wider the range in the oil, the more additives the oil has in it. You are correct about the additives wearing out more quickly though.
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post #9 of 18 Old 09-14-2012, 03:13 PM
PolkaPower
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Quote:
Originally Posted by Robert_Beers View Post
Actually the opposite is true. The wider the range in the oil, the more additives the oil has in it. You are correct about the additives wearing out more quickly though.
I thought I said that 5w 30 has more additive packs. 5w 30 has a wider range than 10w 30 right?

Quote:
There have been instances where the larger amount of viscosity modifiers that are present in 5W30 have broken down due to excessive heat and have left carbon deposits on the valves, but this is extremely rare. The proper fix would be to reduce the excessive heat, but the workaround was to use an oil with less viscosity modifiers.
http://www.nordicgroup.us/oil.htm#5W30 versus 10W30
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post #10 of 18 Old 09-14-2012, 03:41 PM
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5w-30 synthetic in the winter. It doesn't thicken like conventional oil on cold engines so it can get up inside quicker. And it helps to keep the engine clean.
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post #11 of 18 Old 09-14-2012, 05:08 PM
Kevinyj95
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Actually Syn and conv has the same viscosity. Also as syn wears out it thickens. Just lasts longer. Otherwise it wouldnt be 5w30. I once changed some ones oil that hadnt changed it in awhile with syn and it cam out all chunky like curdled black milk. was nasty cant imagine what the engine must be like inside.Some people dont realize how important it is that you change your oil. To many idiots makeing articles sayying you dont need to change your oil when your manufacturer recomends.
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post #12 of 18 Old 09-14-2012, 05:12 PM
Kevinyj95
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Like my wranglers po. Long story short bad bearings at 120k. Very sad sits in my yard waiting..........
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post #13 of 18 Old 09-15-2012, 07:29 AM
Robert_Beers
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Quote:
Originally Posted by PolkaPower View Post
I thought I said that 5w 30 has more additive packs. 5w 30 has a wider range than 10w 30 right?



http://www.nordicgroup.us/oil.htm#5W30 versus 10W30
My bad man...you had it right.
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post #14 of 18 Old 09-15-2012, 07:36 AM
Robert_Beers
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Originally Posted by stormer1092 View Post
Well for the last few years ive been running 10w30 year round but its loud when i start it up when its close to 0 degrees around here. I was thinking of switching to 5w30 in the winter just to get rid of this problem and get better protection on start up. My 4.0 has 212,000 miles on it also would this effect anything?
If you want to do some research on the subject check out bobistheoilguy.com. TONS of interesting info that is backed up with real testing. Something I learned from them is the fact that a lot of 5w30 oils break down very quickly. I started using synthetic Rotella 5w40 because it holds up well over the course of it's lifespan. Also found out that the Mobil 1 5w30 I was using isn't very good, even though a lot of their other oils are excellent.
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post #15 of 18 Old 09-15-2012, 08:59 AM Thread Starter
stormer1092
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Quote:
Originally Posted by Robert_Beers View Post
If you want to do some research on the subject check out bobistheoilguy.com. TONS of interesting info that is backed up with real testing. Something I learned from them is the fact that a lot of 5w30 oils break down very quickly. I started using synthetic Rotella 5w40 because it holds up well over the course of it's lifespan. Also found out that the Mobil 1 5w30 I was using isn't very good, even though a lot of their other oils are excellent.
Allot of cars run 5w30? I don't understand why it would break down quicker. I change my oil every 3000 miles no matter what.
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