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katflap · 11-02-2016, 11:48 AM

As far as I am aware how you vent your crankcase will make no difference to the amount of fuel or water contaminant remaining present in your oil.

It is all to do with speed of evaporation. The hotter your oil the quicker the contaminants evaporate. The ideal situation being to boil it off almost as quickly as It has been deposited in your oil via the blow by gases.

Last winter my oil level was actually rising due to the oil temp being too cold to evaporate the contaminants off fast enough. The fact that I was doing mainly short commuter trips didn't help (1/2 hr each way). In spring and summer, the problem lessened and eventually stopped

Now I have a higher temp thermostat which in turn raises the oil temp the problem, so far, has not returned (5degs C this morning).

I agree that venting directly to the air box is a bad idea and venting to atmosphere is best. but for me, I'm happy with using the OCS compromise.

11-02-2016, 11:48 AM	#42
katflap Join Date: Jan 2015 Location: England Posts: 382	As far as I am aware how you vent your crankcase will make no difference to the amount of fuel or water contaminant remaining present in your oil. It is all to do with speed of evaporation. The hotter your oil the quicker the contaminants evaporate. The ideal situation being to boil it off almost as quickly as It has been deposited in your oil via the blow by gases. Last winter my oil level was actually rising due to the oil temp being too cold to evaporate the contaminants off fast enough. The fact that I was doing mainly short commuter trips didn't help (1/2 hr each way). In spring and summer, the problem lessened and eventually stopped Now I have a higher temp thermostat which in turn raises the oil temp the problem, so far, has not returned (5degs C this morning). I agree that venting directly to the air box is a bad idea and venting to atmosphere is best. but for me, I'm happy with using the OCS compromise.
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