Too bad the glow plug kit isn't available for '86/'87 OM603 or I'd consider it. Heard a lot of good things about Beru GPs I was going to order some if mine turned out to be bad.

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Current cars:
1987 Mercedes 300D
1997 Turbo Nissan Maxima
2001 Lexus IS300 2JZ-GTE & 6 speed swap
2002 BMW E46 M3 - done ... needs engine management
2005 E55 AMG - mods started starts with a pulley and goes on from there!!!