Changing ENGINE OIL should be done every 6 MONTHS or 10,000 KM.
Regular ENGINE OIL changes makes all the difference between a noisy and a quiet running engine. An engine that is well SERVICED will far out-last and out-perform a neglected engine.
The first ENGINE OIL CHANGE is the most important. During the engine's RUNNING IN period many small pieces of metal from the casting process will be in the ENGINE OIL. 
Some CAR MANUFACTURERS such as BMW recommend SERVICE INTERVAL of 25,000 KM, which means the first OIL CHANGE will be done at 25,000 KM. In my opinion this is AUTO ABUSE! The reason for CAR MANUFACTURERS recommending such large SERVICE INTERVALS is purely because it makes the car seem cheaper to maintain and therefore more attractive to the prospective new car buyer and lease companies.
SLUDGING occurs due to lack of OIL CHANGES or use of POOR QUALITY ENGINE OIL.
SLUDGING is when oil loses all VISCOSITY and becomes black and TAR like. SLUDGE can be found through-out a neglected engine, under the rocker cover and in the ENGINE SUMP, where the PICK-UP for the engine oil pump bill be blocked by SLUDGE staving the engine of oil and causing severe issues with LOW or NO OIL PRESSURE.
SLUDGING causes problems with parts in the engine that work HYDRAULICALLY including lifters and timing chain tensioners. Noisy lifters and loose timing chains cause wear on engines and can trigger engine warning lights and running rough. Unfortunately there is no repair for a sludged engine. Prevention is the cure.
Regular ENGINE OIL changes makes all the difference between a noisy and a quiet running engine. An engine that is well SERVICED will far out-last and out-perform a neglected engine.
The first ENGINE OIL CHANGE is the most important. During the engine's RUNNING IN period many small pieces of metal from the casting process will be in the ENGINE OIL. Some CAR MANUFACTURERS such as BMW recommend SERVICE INTERVAL of 25,000 KM, which means the first OIL CHANGE will be done at 25,000 KM. In my opinion this is AUTO ABUSE! The reason for CAR MANUFACTURERS recommending such large SERVICE INTERVALS is purely because it makes the car seem cheaper to maintain and therefore more attractive to the prospective new car buyer and lease companies.
SLUDGING occurs due to lack of OIL CHANGES or use of POOR QUALITY ENGINE OIL.
SLUDGING is when oil loses all VISCOSITY and becomes black and TAR like. SLUDGE can be found through-out a neglected engine, under the rocker cover and in the ENGINE SUMP, where the PICK-UP for the engine oil pump bill be blocked by SLUDGE staving the engine of oil and causing severe issues with LOW or NO OIL PRESSURE.
SLUDGING causes problems with parts in the engine that work HYDRAULICALLY including lifters and timing chain tensioners. Noisy lifters and loose timing chains cause wear on engines and can trigger engine warning lights and running rough. Unfortunately there is no repair for a sludged engine. Prevention is the cure.
In older ENGINES over 150,000 KM I recommend a SERVICE INTERVAL of 5,000KM or 6 months and consider a THICKER and HEAVIER GRADE OIL such as 10w30 or 15w40. For smokey ENGINES that USE OIL try using 20w50. Engines with HYDRAULIC LIFTERS can develop LIFTER NOISE "tap tap tap tap" due to lack of oil pressure to BLEED up the lifters.
Checking engine oil level between services is a good practice as TOP UPS may be needed. You can check engine oil by using the DIPSTICK.
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