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06-22-2007, 12:12 AM
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Hummer Professional
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Join Date: Mar 2003
Location: N.CENTRAL OHIO
Posts: 474
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Re: Synthetic Oil
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Originally Posted by f5fstop
Last tests I saw showed that only two oils were group IV:
Mobil 1
Amsoil ASL
All other major oils, advertised as synthetic were Group III:
Castrol
Shell
Pennzoil
Valvoline
Havoline
Quaker
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OK f5, I use a lot of Schaeffer's oils and grease.
looks like they are a mix of both.
http://www.schaefferoil.com/
__________________
07 White H3 Adventure w/ some black stuff
04.5 GMC D/A CC SLT LB EFI LIVE tuned
98 ZR-2 Blazer
Ex H2&3 owner
My hiking boots and canoe paddle have more miles than most 'offroad' vehicles, over 350 in last year.
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06-22-2007, 12:23 AM
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Hummer Authority
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Join Date: May 2006
Location: Arvada, CO
Posts: 1,139
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Re: Synthetic Oil
As I understand it, synthetic oil doesn't cause leaks, it just finds them. Probably what happened is you already had a leaky or cracked gasket, but it was plugged with sludge. The synthetic oil just cleaned it out. Of course, now it'll leak until you fix the gasket. 
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2007 slate blue 5spd w/ adventure package. Still pretty much stock ... dammit
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06-22-2007, 04:55 AM
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Hummer Authority
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Join Date: Mar 2006
Location: Chicago, IL
Posts: 1,086
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Re: Synthetic Oil
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Originally Posted by Wisha Haddan H3
As I understand it, synthetic oil doesn't cause leaks, it just finds them. Probably what happened is you already had a leaky or cracked gasket, but it was plugged with sludge. The synthetic oil just cleaned it out. Of course, now it'll leak until you fix the gasket. |
thanks, gotta get on that.  |
06-22-2007, 02:12 PM
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Hummer Guru
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Join Date: May 2005
Location: Virginia Beach
Posts: 5,081
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Re: Synthetic Oil
thanx for the info...
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06-22-2007, 05:41 PM
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Hummer Veteran
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Join Date: Jun 2007
Location: Northern VA
Posts: 148
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Re: Synthetic Oil
Good read...
I am always baffled at my OnStar oil life report that reads that my oil has 58% remaining when I've exceeded 4K miles. The dealer wants you in at 3K miles and with synthetics OnStar believes that 8K miles you should change your oil. I have been going in every 4.5K miles.
Last edited by algy : 06-22-2007 at 05:47 PM.
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06-22-2007, 06:04 PM
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Re: Synthetic Oil
Quote:
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Originally Posted by algy
Good read...
The dealer wants you in at 3K miles and with synthetics OnStar believes that 8K miles you should change your oil. I have been going in every 4.5K miles.
Attachment 41281 |
Ignore the dealer on this topic. Why the frequent oil changes at 4.5K? |
06-22-2007, 06:45 PM
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Hummer Veteran
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Join Date: Jun 2007
Location: Northern VA
Posts: 148
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Re: Synthetic Oil
Well if the owner?s manual states to change the oil every 3,000 miles and you don't... GM will void your warranty. At least that's what I've heard.
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06-22-2007, 12:43 AM
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Hummer Guru
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Join Date: Jul 2005
Location: Idaho
Posts: 4,744
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Re: Synthetic Oil
Quote:
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Originally Posted by DURAMAX TIM
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I have heard of them, but I don't have any experience or test information on their product. They say they meet the GM spec for synthetic, so it is probably as good as any other syn oil.
__________________
Black Sheep Hummer Squadron
(ME TOO)
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