What brand of glow plugs would you purchase? Would you replace them all at the same time? Any ideas on where to purchase the brand you recommend on line?

Thanks

 

Motorcraft plugs only! They are made by Beru. No autolites or bosch. ZD-11 plugs are what you need. Autozone used to carry them but not any more. I replace each as they go bad. If down time for your truck is critical might be a good idea if you have 1 bad on a bank do all 4.