Oil changes at 6mths?

[rowinz]

Can anyone tell me why there is a recommended max time between oil changes? I use my Prado infrequently, (ie ~5000km annually), but I believe diesels recommended to change 6 mthly - why? What happens to the oil if it sits for long periods unused? Or is this aimed at low mileage, long idling situations (ie commuting)?

[mike]

diesels should be changing their oils every 5000k's as the oil degrades. Not sure on the longevity of diesel oil but perhaps it degrades over time as well hence why they recommend the 6 months time frame.

[TJ]

My understanding is that it starts to build up condensation in the sump. An engine that is not run frequently at high enough temperatures will end up having cracked/dry seals and rusty exhausts.

[PR]

I own a 2002 Toyota Hiace 3L desiel and only change the oil every 10,000kms (2 months or less) I have now done 450,000 kms and the new Merc desiels get there oil changed every 40,000 kms so I dont think it degrades that much

Now everyone can give me shit cause I own a Toymotor

[mike]

I own a 2002 Toyota Hiace 3L desiel and only change the oil every 10,000kms (2 months or less) I have now done 450,000 kms and the new Merc desiels get there oil changed every 40,000 kms so I dont think it degrades that much

Now everyone can give me shit cause I own a Toymotor

so there is a little bit of coolness in you after all

Mike

[wjw]

I own a 2002 Toyota Hiace 3L desiel and only change the oil every 10,000kms (2 months or less) I have now done 450,000 kms and the new Merc desiels get there oil changed every 40,000 kms so I dont think it degrades that much

Now everyone can give me shit cause I own a Toymotor

Is it the 3 litre or the 3 Litre Turbo as the Turbo definitely requires oil changes every 5000km.

[PR]

Mines a non turbo and the Mercs are turbo

[UBZ]

the Gregorys 1KZ-TE 3L turbo manual I have says to change the oil every 5k or 3 months and the filter every 10k
Ive always changed the filter with the oil

[tallsam66]

Ive got a 1KZTE 7 change oil every 5000 & filter every 10,000,
changing your filter every 5 is a waste of money & time.
Oli filters actually become more efficient as they become more blocked as they then remove smaller particles.

What is filter efficiency?
The percentage of dirt that a filter removes. The filter paper or 'media' determines what the oil, air or fuel has to pass through and where the dirt is trapped. The more twists and turns a particle of dirt has to take, the more likely it is to be captured.

The higher the efficiency, the higher the % of dirt retained by the filter. Filters are least efficient when new and become most efficient just before "plugging".

[rangimotors]

Ive got a 1KZTE 7 change oil every 5000 & filter every 10,000,
changing your filter every 5 is a waste of money & time.
Oli filters actually become more efficient as they become more blocked as they then remove smaller particles.

What is filter efficiency?
The percentage of dirt that a filter removes. The filter paper or 'media' determines what the oil, air or fuel has to pass through and where the dirt is trapped. The more twists and turns a particle of dirt has to take, the more likely it is to be captured.

The higher the efficiency, the higher the % of dirt retained by the filter. Filters are least efficient when new and become most efficient just before "plugging".

wow thats interesting aye, i always change mine a 5k for the sake of the couple of dollars they are worth trade, but maybe ill change my ways

[TJ]

Ive got a 1KZTE 7 change oil every 5000 & filter every 10,000,
changing your filter every 5 is a waste of money & time.
Oli filters actually become more efficient as they become more blocked as they then remove smaller particles.

What is filter efficiency?
The percentage of dirt that a filter removes. The filter paper or 'media' determines what the oil, air or fuel has to pass through and where the dirt is trapped. The more twists and turns a particle of dirt has to take, the more likely it is to be captured.

The higher the efficiency, the higher the % of dirt retained by the filter. Filters are least efficient when new and become most efficient just before "plugging".

That is partly true because "plugging" would decrease the flow rate and volume through the same surface. So a completely plugged filter would be brilliant at blocking smaller objects, but would starve the engine of sufficient flow of oil. Finding a balance between is the key.

[UBZ]

I learnt some thing today

Will have to change my ways also

[Jezza]

So a completely plugged filter would be brilliant at blocking smaller objects, but would starve the engine of sufficient flow of oil.

Don't oil filters have a spring by-pass in the base, so if it's clogged then it won't starve the engine.

[TJ]

Some modern ecu kill the engine if the pressure is too low to save the engine from damage. This comes handy if the oil pump goes south.