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Old 06-11-2009, 06:17 PM   #1
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Default Is Mobil 1 5w-30 ok to put in my SC?

I am going to try and change my bad coupler this weekend. I wanted to know is Mobil 1 5w-30 syn oil ok for this? Thanks guy'* for all of your help.

Last edited by trixster68; 06-11-2009 at 06:18 PM. Reason: Forgot something
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Old 06-11-2009, 06:27 PM   #2
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Good question. One of our members found out that there is a TSB about it. And the TSB says you can.

https://www.gmforum.com/t279121/

Thanks again to TLSheff
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Old 06-11-2009, 06:39 PM   #3
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There are some write ups in tech info about doing that and they reference being able to use Mobil1
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Old 06-11-2009, 07:00 PM   #4
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Should I try it? Or should I get the GM */C Oil? Thanks guy'*
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Old 06-11-2009, 09:39 PM   #5
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Quote:
Originally Posted by trixster68 View Post
Should I try it? Or should I get the GM */C Oil? Thanks guy'*
Per the tech bulletin it'* okay. The Mobile 1 is cheaper than a bottle of SC oil.
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Old 06-11-2009, 09:49 PM   #6
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I plan to use it in every SC I rebuild. The last one I did a rebuild on I used the GM snout oil only because I had a bottle.
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Old 06-12-2009, 08:13 AM   #7
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If I remember right, isn't there phosphoric acid in the OEM oil? I remember it smelling like yuke. There had to be a reason they'd use a corrosive like that. I'm all for the Mobil 1, but that seems like quite a difference to me.
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Old 06-12-2009, 08:32 AM   #8
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Most likely there is a specific reason or was a reason for it. There is also afterthought which led to GM sending out the pictured TSB in that thread.

The TSB says it is an option. When I order parts etc from vendors, I will probably always buy the SC oil, out of preference. Between the normal cost and shipping it can be a reasonable difference that some might have trouble justifying knowing that GM issued this TSB. My local dealer gives me a great price on it....other folks end up paying close to $30 for two bottles at the dealer.
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Old 06-12-2009, 10:19 AM   #9
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My thought is that there were very few choices for synthetic oil at that time. Now there are many choices.

Here'* a thought. Doing a oil change with filter is 4.5 quarts. The jugs are 5 quarts. You do a oil change and have half a quart left over. While the car is up and the pan is draining you can remove the SC plug, suck out the oil, then add 8 oz and put the plug back. About 5 mins. Now your oil has finished draining from the oil pan and you can finish the oil change. Changing your snout oil with each oil change is totally easy.
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Old 06-12-2009, 11:34 PM   #10
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I have just replaced the oil in mine due to not kowing the history of the car, the oil was 5$ cad a bottle at the dealer down the street from me. I thought that was a lot of $$ but guess not
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