I know that, because of the design, the glow cycle on an OM648 is much shorter than on an IDI. But, so far, down to maybe 25F, I've never scene the glow light stay on longer than a second. What happens at, say, -10F? Does it say on significantly longer? Or is it always really fast irrespective of ambient temperature?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife