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Registered User
Join Date: May 2008
Posts: 11
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, 07:38 PM
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krasuskyp's Avatar
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,141
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!
Paul... CT | '87 930 | '07 //S6 v10 JNR | '98 ///M3 vert |

| '01 ///M5 | '96 993 C2 cab | '05 S600 Sport - biturbo V12@Just Not Right 495rwhp / 612rwtq |
| '58 TR3A | '01 //S8 | '95 //S6 6gang | '88 ///M5 | '87 190E 2.3-16 |
Old 05-27-2008, 05:49 AM
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Crotchety Old Bastard
RarlyL8's Avatar
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,563
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?
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, 06:33 AM
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Registered User
Join Date: Mar 2005
Location: Near Atlanta
Posts: 128
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.
Old 06-03-2008, 10:37 PM
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