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test do not guess
i use a pressure transducer in the oil stick tube , sealed to the tube , snap the throttle to WOT , wide open throttle and record the pulses synced on spark from any cylinder -
you will be recording blowby pressure in the crankcase , the leak that gets by the piston rings during combustion
the average pressure must be about 0 in psi or hg or kpa or what ever else you choose - no pressure pulse should be any different than any other
of course
you do not know what i type of -
none the less in an extreme case , such as yours a balloon sealed on the oil stick tube will suffice , the balloon must not expand or blow up at WOT snap if it does , the piston rings leak too much and the PCV valve can not flow enough to relieve the pressure
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intake vacuum , measured at the fuel pressure regulator , vacuum gauge teed in , should be at least 18" 20" is better at hot idle , but more important
there must be no flutter in the needle as in zero flutter , any flutter at all shows a leaking valve -
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"high mileage oil" is garbage and should never be used for anything except fuel in your heating oil tank -
read the ACEA specifications on the back of the bottle
if it does not show
ACEA A1 B1,A5 B5 good or ACEA A3 B3, A3 B4 much better
do not use it
if there are no ACEA specifications , Unless it has the OEM specification for your engine
DO NOT USE IT, read more at the BITOG forums
one thing dogshnit oil causes is
carboned up piston rings , which may be your problem
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