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Discussion Starter · #1 · (Edited)
I've been running Mobil 1 5w-30 in the Zee, but was wondering if switching to 10w-30 might cut down on some oil consumption.

My Zee isn't too bad on oil ... maybe a quart every 2500 ~ 3000 miles or so if driven pretty "spirited" ... not raced.

Anyone switch from 5w-30 to 10w-30 and see any difference in oil consumption?

Also, has anyone determined if the oil brand makes any difference ... say Mobil 1 10w-30 vs. Amsoil 10w-30. Both meet the GM oil spec. :cheers:
 

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IMO you will see no difference in oil consumption. Your consumption is normal and better than most. I use 10W30 myself because it's so hot in South Florida.

The new Mobil 1 Extended Performance 5W or 10W-30 does not meet GM 6094M/GM4718M spec. The Mobil 1 5W or 10W-30 synthetic does. I Emailed Mobil about this. There response was that Mobil 1 Extended Performance does not meet GM spec GM4718M and to use either Mobil 1 10W-30 or 5W-30 synthetic with no explanation. Even-though I specifically asked for one.

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Discussion Starter · #3 ·
IT L GO said:
The new Mobil 1 Extended Performance 5W or 10W-30 does not meet GM 6094M/GM4718M spec. The Mobil 1 5W or 10W-30 synthetic does. I Emailed Mobil about this. There response was that Mobil 1 Extended Performance does not meet GM spec GM4718M and to use either Mobil 1 10W-30 or 5W-30 synthetic with no explanation. Even-though I specifically asked for one.
That's strange that their "better" oil won't meet the GM spec. I was planning on using the original Mobil 1 or else Amsoil 10w-30 come the next oil change. Both meet GM4718M, so can't go wrong I suppose.
 

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ZeeOhSix said:
That's strange that their "better" oil won't meet the GM spec. I was planning on using the original Mobil 1 or else Amsoil 10w-30 come the next oil change. Both meet GM4718M, so can't go wrong I suppose.
While I agree that you probably can't go wrong with either, the AMSOIL SAE 10w30 is formulated for a 25k mile change interval whereas the Mobil 1 is not. AMSOIL commissioned this indepedent lab test of 10w30 motor oils in March - May of 2003 and I feel the results show the difference in this formulation approach. Note, the Mobil used in this test is the Mobil 1, not the new EP. :cheers:
Comparative Oil Test
 

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The real answer is which oil protects your main's the best.

As you spin up your motor to higher RPM's the additives are the last thing to protect your main bearing's.

If you are not spinning your motor higher than the stock rev limiter then I'd go with the OEM suggested oil and live with the oil consumption and just add oil as needed.
 

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IT L GO said:
IMO you will see no difference in oil consumption. Your consumption is normal and better than most. I use 10W30 myself because it's so hot in South Florida.

The new Mobil 1 Extended Performance 5W or 10W-30 does not meet GM 6094M/GM4718M spec. The Mobil 1 5W or 10W-30 synthetic does. I Emailed Mobil about this. There response was that Mobil 1 Extended Performance does not meet GM spec GM4718M and to use either Mobil 1 10W-30 or 5W-30 synthetic with no explanation. Even-though I specifically asked for one.

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When i was in Wal-Mart the other day buying Mobil 1 i read all the labels. There are gonna be a lot of people buying the new extended performance thinking it is better. But if you read on the back of the bottles, only the original Mobil 1 Synthetic says, comes from the factory in the Corvette. Plus Viper, BMW, Porsche, Etc. The others, i think there are 3 different versions of the extended, say nothing about these cars. Plus they do not have the rating #'s for Vettes listed on them. So be very careful when you buy, the bottles look very similar. :screwy:

Jack
 

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Discussion Starter · #7 ·
pat03z06 said:
The real answer is which oil protects your main's the best.

As you spin up your motor to higher RPM's the additives are the last thing to protect your main bearing's.

If you are not spinning your motor higher than the stock rev limiter then I'd go with the OEM suggested oil and live with the oil consumption and just add oil as needed.
I would think that the "Four Ball Wear" test would give a good indication of the oil's bearing wear protection.

As you can see in Subdriver's link -- Comparative Oil Test -- the Amsoil was rated at 0.40 mm wear scar while Mobil 1 SuperSyn was rated at 0.60 mm wear scar ... that's 50% more wear.



I’m also wondering if maybe using the Amsoil would reduce some oil usage due to it’s lower “NOACK Volatility” ... almost half of Mobil 1.



Amsoil sure looks good in all the lab tests! :yeadog: Subdriver, I haven't forgot about your offer.
 

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I got a case of this stuff. Mobil 1 5w30 SuperSyn.

Exceeds ILSAC FG-3 and API Service SL, SJ, Cf Meets ACEA A1/B1/A5/B5-02 Meets GM 4718M

Let me know if I need to return this before my next oil change.

Thanks guys....

JB
 
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