Just now, I went to start my TD. It took about 3 times longer than normal and idled at 450-500rpm. I removed the oil cap to look at the lobes for oil pressure as my oil gauge is not connected. There was a slight trickle falling just short of the lobe so I hit the stop lever to kill it. Second try, I let the glowplugs run for 3 cycles and started it, getting the same results.

Last march, even in 27*f outside it started fine with the block heater after 3 hours. I did not use the block heater last night as it was 60*f at 10pm. It is 40*f now.

Is this just a case of neglect for not using the block heater or something else?

BTW, this is the second day after switching to Mobil1 15W-50.