Quote:
Originally Posted by blueosprey90
Probably a combination of too much and too thick of an oil. As the piston rises, the oil isn't able to bypass the piston damper and is then forced out of the cap. I think I'm using a light machine oil in my Volvo SUs - something like a sewing machine oil. Filled to about an inch below the top.
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SAE20 is the correct oil for SU's and it needs to be that thick to function correctly. AFT is too thin (but correct for strombergs or in conditions below zero.
Running a thinner oil will cause leaning out under acceleration and this can lead to VSR. As the carbs wear it can be better to go slightly thicker again with the oil