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The problem I have noticed, in so many cars today, is due to EFI intake manifolds being 'cold'. The hot oil vapors condense in the cold manifolds and collect like crazy. Many of us are beginning to use inexpensive air/water separators plumbed into the PCV hose in order to reduce the effect to a tolerable level. Some cars have very big problems resulting from the amount of oil getting into the tops of the cylinders and wreaking havoc with emission devices and carbon build-up on pistons and valves. Corvettes and Cadillac V-8s are notorious. In fact, Cadillac dealers are having to use several applications of their extremely strong top engine cleaners in order to remove the deposits that cause piston/carbon/head contact noise/knocking and detonation.
The separators are drained at each oil change and really do help.
This is an industry-wide issue. Watch in the near future for innovative changes to the system in order to alleviate the problem.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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