can cold starting w/out glow plugs cause significant coking in these cars?

I ran unheated WVO at the end of last summer and have been running it this summer. Straight, no additives. I've had no problems starting or running my car.

I only replaced the filter yesterday for the first time in 2-1/2 years since I got the car up and running.

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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

Yes. Starting with cold WVO will cause coking; starting with no Glow Plugs can't help. You may also want to try a compression test. WVO can cause the piston rings to stick causing a loss of compression and hard starting.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine