For the past month in Northern California my otherwise reliable 82 300 SD has been either a pain to start or would not start. I changed the glowplugs and tested as I removed each gp . . . two were burned out and would not glow. This morning was 28 degrees, a good test . . . Car fired almost immediately! Back to normal and to think just two plugs created this condition! I did the job just before Thanksgiving dinner, now I am very thankful! Love the simplicity of my diesel!