Mine fired right off this morning when the temps were in the high 20's. Amazing what new glow plugs will do, I still have 15w-40 dino in the sump to. If I can get it to start down to 20 with the dino screw spending $40 on synthetic I'll plug it in below that.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200