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Who's going to change to the Mobil 1, 0W-40

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Old 02-23-2018, 05:37 PM
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c6miller
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Default Who's going to change to the Mobil 1, 0W-40

Been using 5W-30 since new (7 years) Mobil says we should change to the new formula. Is anyone going to switch?
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Old 02-23-2018, 05:43 PM
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919cw313
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Nope.
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Old 02-23-2018, 05:46 PM
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HBsurfer
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Where did you see Mobil telling us to change? A tv commercial or a magazine ad means nothing to me. If it is stated in an article that gives a solid reason that makes sense to me, I would listen. If not, I will stay with what GM says since they designed the engine.

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Old 02-23-2018, 06:07 PM
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Vette_DD
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Originally Posted by c6miller View Post
Who's going to change to the Mobil 1, 0W-40 Been using 5W-30 since new (7 years) Mobil says we should change to the new formula. Is anyone going to switch?
I wasn't aware that Mobil had either built your engine or was guaranteeing it.

Stick with what your owner's manual says.
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Old 02-23-2018, 06:28 PM
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Guess I'll stay with what works? Why would I change now, all is well.
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Old 02-23-2018, 06:39 PM
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jrose7004
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No I'm not changing.
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Old 02-23-2018, 06:43 PM
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Dano523
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the thinner the oil, the lower your oil pressure is going to be a idle instead. Hence if your oil pressure is below say 30lbs at idle, you already have problems, and going with a thinner oil is going to push you even more in the wrong direction instead.
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Old 02-23-2018, 07:42 PM
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Originally Posted by Dano523 View Post
the thinner the oil, the lower your oil pressure is going to be a idle instead. Hence if your oil pressure is below say 30lbs at idle, you already have problems, and going with a thinner oil is going to push you even more in the wrong direction instead.
It's a 40 weight, it's not thinner oil. On startup, above freezing temperatures, there is essentially no difference between a 0 and 5.

C6s in Europe have always used 0w40.

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Old 02-23-2018, 07:44 PM
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I changed to 0W40 a while back when Mobil had it on sale plus a $12 rebate. Ran the hell out of it all summer.
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Old 02-23-2018, 10:27 PM
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Why would anyone? It is the same oil with an expanded viscosity rating. If the 5-30 is fine, why change?
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Old 02-23-2018, 10:30 PM
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I am going to stay with the OEM/factory recommendation printed on the oil filler cap.
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Old 02-23-2018, 10:36 PM
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I'm waiting for 1ľW-30, then Imma changing.


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Old 02-24-2018, 12:06 AM
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I thought I read where GM recommends it for LT engines in the C7. Not the LS motors in the C6. So no I am not switching.

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Old 02-24-2018, 12:29 AM
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Old 02-24-2018, 01:04 AM
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That thread is discussing Tadge's recommendation for C7's. This is the C6 section. Different engines. Different oil.

Last edited by HBsurfer; 02-24-2018 at 01:05 AM.
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Old 02-24-2018, 02:01 AM
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In answer to your question...no, I'm not changing. On the other hand, 5w-30, 0w-40...not enough difference in my opinion to make a difference, but then I'm not an oil or engine engineer. I've been told to use Motul, but I've never heard of it before. I also have a friend who thinks Pennzoil is the only oil made. I'll stick with Mobile 1 5w30. Its worked this long.
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Old 02-24-2018, 02:35 AM
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The brand doesn't matter. As long as the SAE(?) numbers on the bottle meet the manufacturer's specs, you're fine.
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Old 02-24-2018, 05:27 AM
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Why would I put any other weight oil in my car other than what is recommended in my owners manual? only a dumbass who knows nothing about engines would do that. IMO

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Old 02-24-2018, 07:32 AM
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Originally Posted by HBsurfer View Post
That thread is discussing Tadge's recommendation for C7's. This is the C6 section. Different engines. Different oil.
Really? I thought that was so obvious, I didnít need to state it. Guess not.
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Old 02-24-2018, 08:21 AM
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Originally Posted by Dano523 View Post
the thinner the oil, the lower your oil pressure is going to be a idle instead. Hence if your oil pressure is below say 30lbs at idle, you already have problems, and going with a thinner oil is going to push you even more in the wrong direction instead.
this is so inaccurate itís comical. Idle pressure on the non dry sump engines is rarely over or at 30 psi when oil is over around 200 deg for most LS engines....and that is normal. The high weight is the same as what is spec so the high temp viscosity is the same as spec. The low weight mumber means better viscosity flow when colder than 5 weight. You want the oil moving around with ease when cold. 0-30w is actually a better oil for northern cars in the cold months.
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