Driving the S600 for the first winter, temperature last 2 days has been below freezing. S600 drives fine when cold up to any length of time, when I stop and restart it 5 minutes later it gives me a check engine light and reduced power/some stumbling when driving. The check engine light goes on about 30sec after the hot restart. When I stop and restart the car quickly thereafter, the check engine light stays on but full power or no noticeable power/stumbling issues. When I start in the morning cold check engine light dissappears, no issues.

This has happened this weekend so no chance to bring it to the dealer yet, just wondering whether this could simply be related to the ethanol recall.... will try non-ethanol based fuels tomorrow.

Any ideas would be appreciated.