4 or 5 out of 5 on my 300SD, wouldn't start when it got cold.

The strange thing is they all tested fine with a meter. But when you took one out and put it on a battery it did everything but glow. The new ones got toasty red.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200