Throw those Monark plugs as far away as you can

I replaced some reasonably good Bosch plugs in my '86 300SDL with a set of "Monark Diesel" plugs.

Over the next year, I had a hell of a time starting the car. It would start and stumble for 15 seconds before the idle became somewhat stable. Once I put a new set of Bosch plugs in, the car was better than ever!

It took a while to even figure out that it was the plugs.. I did some other work the same day I replaced the plugs so had to troubleshoot the other stuff first. Had no idea a set of glow plugs could make such a HUGE mess!

Neal

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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)