Severe operating conditions

[Allan023]

Why are "engine idling for a long period" or "short-distance travel" considered as Severe Operating Conditions? All others related to "more stress". I don't see how these 2 can cause more stress to the engine? thanks

[dr. d]

Why are "engine idling for a long period" or "short-distance travel" considered as Severe Operating Conditions? All others related to "more stress". I don't see how these 2 can cause more stress to the engine? thanks

errr... the oil doesn't get to flow optimally?

[papi smith]

How far do you have to travel or long idling before the oil flows optimally? I read somewhere here that it takes only seconds before the oil completely covers the moving parts.

[Allan023]

errr... the oil doesn't get to flow optimally?

With all the advancement we've made in automotive technology, we cannot make the oil flow optimally if we don't travel far enough, even if we have the engine running?

[jick.cejoco]

To give the doubt the benefit:
Service intervals and warranty covers time or mileage whichever comes first. Unless your car has start/stop capability (engine stops when engine is running and vehicle is stopped for more than three seconds), the engine continues to run whether you like it or not with zero, zilch, nothing added to your odometer reading while the engine is running. As for short drives, the oil does not get hot enough to rid itself of moisture or contaminants which are byproducts of combustion released as blowby gases

[jick.cejoco]

And your car does not have an hour meter like a standby generator

[Walter]

Long idling or driving in traffic is not good because of heat, the engine is not ventilated well compared to when it's running in an open road. Frequent short trips (less than 5 kms or 10 minutes) is not good because the engine / DPF / catalytic converter has not fully warmed up.

[Walter]

With all the advancement we've made in automotive technology, we cannot make the oil flow optimally if we don't travel far enough, even if we have the engine running?

That would be an electric car ...

[Allan023]

To give the doubt the benefit:
Service intervals and warranty covers time or mileage whichever comes first. Unless your car has start/stop capability (engine stops when engine is running and vehicle is stopped for more than three seconds), the engine continues to run whether you like it or not with zero, zilch, nothing added to your odometer reading while the engine is running. As for short drives, the oil does not get hot enough to rid itself of moisture or contaminants which are byproducts of combustion released as blowby gases

Thank you! Both explanation makes perfect sense!

[Janemar]

Why are "engine idling for a long period" or "short-distance travel" considered as Severe Operating Conditions? All others related to "more stress". I don't see how these 2 can cause more stress to the engine? thanks

1. Engine oil pressure is proportional to engine rpm(unless naka electric oil pump ka or variable oil pump) idle ang lowest oil pressure you will have, meaning least protection sa bearings. Conrod, mains, cam caps, cam lobes, etc...

2. Again, low rpm, low engine oil splash within the engine = Oil level in upper parts of the engine is less than ideal(camshaft/valvetrain/timing chain tensioner/chain guide/head/vtec/vvti/mivec mechanisms are affected.)

3. Given na low oil movement within the engine(oil stagnant pockets will form) at low rpm(idle a.k.a. EDSA trapik) + hotspots + never heard cheap engine oils = engine gunk and sludge!

4. On old systems, EGR and PCV system will do exhaust recirculation and oil mist blow-by to engine intake manifold at idle. Okay lang naman, BUT overtime, daily/repeated very long idle or low engine RPM like 3hours trapik in EDSA, dun nakakaproblema because like oil pressure, intake air speed going to engine is proportional to RPM. High RPM = high air flow going to engine. Stagnant/low air flow during idle + oil vapor from pcv + exhaust fumes from egr = intake manifold sludge, exhaust system, valve stem, sticking rings, piston top and chamber.

It's not saying na overnight, pag dumaan ka sa trapik or nag idle ka ng matagal is sira na agad yan. Overtime it adds up lang especially di mo nasusunod or nagtitipid ka sa PMS or mali ang PMS at di nacheck ung mga dapat i check like sludge build up due to excess idle, etc...