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Join Date: May 2008
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Rough idle after oil change, need help just took delivery of my 76 turbo

I just took delivery of a 76 turbo 47k miles, had a full top end rebuil in 2000 with 40K miles, car needed an oil change, so i read nearly half of the 40+ page thread and decided i didnt want a synthetic oil since it has only run conventional. Anyways, i found a border line oil at autozone with an sl rating that should have enough zn and phos. i put in a 20w50 weight with a new filter. Now the car runs extremely rough at idle until temp comes up and it smoothens up. I looked at the manual and it says that it takes 10.6 quarts and prefers to run sae 30. I am going to change it tomorrow again but need recs from what i can pick up locally or shoudl i just bite the bullet and wait for some swepco. thanks.
Old 05-25-2008, 06:38 PM
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Congrats on the '76 - we want pics! Sounds great.

Sorry I'm of no help otherwise - I just bought 12q Shell Rotella 5w40 to do my first oil change yet on mine. Any suggestions where to get filters and which to get? I'll do a search I guess...

Good luck - let's see it!
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Old 05-27-2008, 04:49 AM
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Oil is oil (within reason). A different brand or weight shouldn't make your engine run rough when cold.
Something likely unrelated has changed during that time. There are a few things that will cause a rough cold idle, generally fuel related.
How long have you had this car? What are the climatic conditions?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-27-2008, 05:33 AM
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You might have over filled it and gummed a plug. I over filled once and had oil dripping from every where. Maybe you sucked a lot down into the engine through the blow by and vent tubes. Pull a couple of the easier plugs and check them for fouling.
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Old 06-03-2008, 09:37 PM
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