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Was it an oil smell or more like electrical insulation?
If oil, I'm with MCA and think you may have a leak on your exchangers. I have that problem with my 79SC. My leak is from both timing chain covers and I think I have another from the pressure switch. Smoke comes through the vent on hard acceleration, braking, or turns.
Fixing these leaks is on my to do list for this summer.
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1979 Porsche 911SC Targa
1996 Porsche 993 C4S
2005 Porsche 996 Turbo S
2020 BMW X3M Competition
2003 BMW M5
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