My car was rocking.
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I ran into trouble years ago running 30 (might have been 50 weight, not multi viscosity, just "50") weight on a day that got pretty cold. When I started my '89 Formula, it rocked and sputtered and I shut it off, tried again, shut it off, eventually the oil got a little heat in it and it started to run right on about the 5th try. I changed the oil that day and had no more issues.
Could be temp related.
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