1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

A Rattling sound at rear of engine...

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Old May 27, 2003 | 11:40 AM
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Default Hit your cat!

I had a very annoying rattle that was my catalytic convertor. The guts became loose. Hit it with a rubber mallet and listen.
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Old May 27, 2003 | 12:05 PM
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Hi

Its a flush. From what I'v heard..it does quite well.

www.auto-rx.com

These people seem to like it:
http://theoildrop.server101.com/ubb/...?ubb=forum;f=5

I may try it on my LSS, as the previous owner fed it a continuous diet of dino, albeit, a oil change every 3k.
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Old May 27, 2003 | 04:56 PM
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Ya auto-rx rocks but I dont really want to spend $50 on an engine treatment right now. I could flush it 10 times for that.
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Old May 27, 2003 | 11:10 PM
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Hi

If what I hear and read is true, flushing with the other petro flushes would not likely get all the built up matter.

Auto-rx seems to require at least two treatments, over a couple thousand miles, and maybe 2 oil changes. There is a specific procedure which must be followed, but which is easy and thorough.

I'll likely do it to mine after I figure out the exhaust project I am contemplating
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Old May 28, 2003 | 12:11 AM
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Ya I've read the site a while back and may do it later, but I will flush out my oil first. Then run it with marvels mystery oil. Which does a crazy good job of cleaning anything out. Then just change it again.
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Old May 28, 2003 | 12:50 AM
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Hi

If you run M1 10w-30, that will clean the engine..but the progress will be slower.
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Old May 28, 2003 | 01:27 PM
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Hmm, think thats on sale at walmart...

Ya mean that stuff that says like Power Clean Plus or soemthing?
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Old May 28, 2003 | 03:57 PM
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Hi

M1 is short for Mobil One synthetic oil. Its been selling for 5q/18.88 which is about 3.75 /qt which isnt bad for a true syntheic. M 1 is a group IV oil wher the others are usually a Grp III.

I've used wally syntheic 10w-30 successfully for years..but change it every 3000. However, as soon as my supply of that goes, I'll be switching over to M1 10w-30.
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Old May 29, 2003 | 02:39 PM
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I thought mobil 1 sold conventional oil too? Someone was tellign me about a cleaning mobil 1. These guys always tell me now to run synthetic in my car because of the mileage, saying it will cause it to leak out my seals or some crap.
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Old May 29, 2003 | 04:20 PM
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Hi

Your talking about Mobil'* dino oil called "Drive Clean". I would suggest you do a search on the "Drive Clean" before using it.

Mobil 1 is Mobil'* synthetic line, which is likely the only grp iv synthetic available otc.
Amsoil and Schaffer'* is also excellent oil.

Mobil 1 10w-30 will be going into my LSS after my current stock of waly synthetic 10w-30 is used up. I have one more change on it..then to Mobil.

Because of the amount of miles i drive, the oil is changed every 2-3 weeks which is 3000 miles. With M1, I'll strech it out to 4500.
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