Curing the nonexistent problem of oil blow-by with a catch can, which pressures up the system and blows a seal, allowing sump oil to escape could have the nasty feedback effect of catastrophic engine failure, and you will not be covered by warranty. Especially in the wet.)įor this reason, curing ‘maybe/nonexistent’ problems is a bad idea. The feedback effects might include reducing the margin between grip and slip - meaning a sudden transition from grip to sliding, with less warning. (For example, upgrading to stiffer springs and stickier, low-profile tyres improves grip - the primary benefit.
It’s ineffective, but might make you feel better.)Īt the regular services, the dealer should inspect the engine (and the EGR and PCV systems) to ensure they’re functioning properly.Īll modifications come with what engineers call ‘feedback effects’ - inevitable changes to the system’s response flowing from some modification to the system. (Fitting a catch can is like taking Panadol for a brain tumour. If they become defective, the fix is to repair the system, not to fit a catch can - obviously. When these systems work properly, there’s no need for a catch can. The PCV system includes an oil separator, designed to catch oil before it it drawn into the engine, and return it to the sump. Additionally, engines have positive crankcase ventilation (PCV) which pumps poisonous crankcase vapours containing atomised oil and noxious vapours (hydrocarbon byproducts) into the engine so that they are burned to less harmful chemicals before they enter the air we breathe. EGR - an exhaust gas recycling system is built in, which improves fuel efficiency and emissions performance. Modern engines are designed to recycle exhaust gas.
If there were an epidemic of engines clagged to death from oil blow-by, then a catch can (or other systematic countermeasure) would be built in at the factory - subject to legislative compliance.
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