Oil changes to a time limit

Submitted: Sunday, Mar 29, 2009 at 09:09
ThreadID: 67286 Views:2522 Replies:3 FollowUps:17
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I have a Toyota 1HZ engine in a Coaster bus ( converted to a campervan) - first time I have ever owned/operated a diesel.

Over the years, I have changed my engine oil in petrol engines according to mainly miles driven - but have occasionally changed it according to a time limit between changes.

I have been fitting this vehicle out over the past 6 months -changed the oil when I first got it - and am now driving it. I do not anticipate doing many miles in it - certainly less than 5000 klms in any 6 month period.

I have heard it said that oils break down with time - but just wondering to what degree this may be an old wives tale (with some degree of truth in it ) -

Any advice please - please bear in mind that this engine has done 330,000 klms , so I am not trying to make a silk purse out of a sows ear!

BarryBA

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Reply By: Member - Nick (TAS) - Sunday, Mar 29, 2009 at 09:32

Sunday, Mar 29, 2009 at 09:32
If your not doing 5000kms in a six month period, I'd just change it every six months(including filter).
My cruiser(1HZ) barely does its 5000kms in six months and if I havent reached it, Ill change it anyway.
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Reply By: Member - Phil G (SA) - Sunday, Mar 29, 2009 at 10:11

Sunday, Mar 29, 2009 at 10:11
The oil itself doesn't decay. But most people who chalk up low k's, do so because they do short trips. And short trips are bad for building up contaminents in the oil because the vehicle doesn't get up to temp and runs richer etc Hence the blanket recommendation to change at least every 6 months.
AnswerID: 356819

Reply By: oldfart1953 - Sunday, Mar 29, 2009 at 10:44

Sunday, Mar 29, 2009 at 10:44
Hi Barry,
Oil change every 5,000k's or 6 months
Oil filter every 10,000k's or 12 months
Fuel filter every 10,000k's or 12 months


Follow this & you may well get another 330,000k's

Tony H
Hunter Valley
Insanity doesnt run in my family.... it gallops!

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Follow Up By: Axel [ the real one ] - Sunday, Mar 29, 2009 at 11:27

Sunday, Mar 29, 2009 at 11:27
Why would you only change the oil filter every 10,000 , if the oil is dirty so is the filter is it not ?? Bit like putting clean feet into dirty socks ,,LOL.
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Follow Up By: Member - Nick (TAS) - Sunday, Mar 29, 2009 at 11:28

Sunday, Mar 29, 2009 at 11:28
I carnt understand why people put clean oil through a dirty filter, just replace them as a "pair".
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Follow Up By: oldfart1953 - Sunday, Mar 29, 2009 at 11:46

Sunday, Mar 29, 2009 at 11:46
Hi Guys,
Thanks for the comments, valid?..... possibly/probably yes....
But as a professional motor mechanic & looking after my clients & not wanting to be accused of over servicing, I believe that if you change the oil every 5000k & oil filter every second oil change (as long as there are
NO problems with the engine or CHANGED operating conditions) this will be more than sufficient.
Not that I'm a greenie or something like that....you'll be saving resources as well.
I understand where you guys are coming from...

Regards
Tony H
Hunter Valley
Insanity doesnt run in my family.... it gallops!

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Follow Up By: Axel [ the real one ] - Sunday, Mar 29, 2009 at 11:56

Sunday, Mar 29, 2009 at 11:56
Oldfart1953 , not having a dig but to really save resources when it comes to oil changes it would make more sense to change a filter than it does to change the oil , after all oil can be cleaned thru filtration whereas the filter once dirty and clogged does nothing, ,,, ;)
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Follow Up By: ross - Sunday, Mar 29, 2009 at 12:05

Sunday, Mar 29, 2009 at 12:05
The oil probably has a lot of smaller particles the filter cannot catch,so changing the oil is the only way to remove them from your engine.
I think the also oil gets "burnt " to some degree from being in contact with hot pistons.
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Follow Up By: oldfart1953 - Sunday, Mar 29, 2009 at 12:08

Sunday, Mar 29, 2009 at 12:08
G'Day Axel,
If an engine is in resonable/servicable condition & is not operating in extreme conditions you could expect a filter to last well in excess of 10,000k's. Would I leave a filter on for more than 10,000k's NO WAY.
Should a filter block ALL filters are fitted with by-pass valves so if the filter medium was to block the oil would still flow through the engine.
Awise man once said ....Opinions are like the dollar coin , not worth much.
Facts however can save you lots of dollars.
Keep smiling
Regards
Tony H
Insanity doesnt run in my family.... it gallops!

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Follow Up By: Axel [ the real one ] - Sunday, Mar 29, 2009 at 12:23

Sunday, Mar 29, 2009 at 12:23
Oldfart1953 , yep know that the filters have bypass ect , thing is there is no actual way to know when the standard filter is already blocked , seems lots of the newer vehicles carry similar oil capacities but much smaller oil filters yet even increase the service time / klm , ok ,fair enough supposedly better filters/medium and better oils /synthetic , but Ill just stick to the 5thou filter and oil on the diesel and 10thou on the petrol ,, lol.
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Follow Up By: oldfart1953 - Sunday, Mar 29, 2009 at 12:51

Sunday, Mar 29, 2009 at 12:51
G'Day Axel,
Yes it is really scary now re filters getting smaller & extended service intervals, say vehicle 'A' has a service interval of 10000k & owner 'Fred' thinks OK it will last till say 15-20000k then has it done....yuk But owner 'B' has a vehicle with a 20000k service interval & owner 'Dave' thinks OK I'll leave it till 30000ks frightening stuff!!

Just as a side issue (I know we are talking about 'light vehicles) & interesting to note a lot of heavy transport, mining & plant equipment oil & coolant changes are not scheduled as such....samples are taken & tested, results of tests then advise to what action to take....ie adding of chemicals to coolant, filter change for coolant, filter change for oil with NO oil change ....remembering that big haulpacks can have a cooling system capacity of around 400 litres & engine sump capacity of 200 plus litres...all comes down to economics.
I'll leave it here have a great day CU down the road
Tony
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Follow Up By: kevanancy - Sunday, Mar 29, 2009 at 14:23

Sunday, Mar 29, 2009 at 14:23
I have the 1HZ and change the filter and oil every 5000km however I know that the local toyota dealers do the oil every 5k and filter every 10k on these motors as I used to get it serviced by them .
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Follow Up By: kevanancy - Sunday, Mar 29, 2009 at 14:24

Sunday, Mar 29, 2009 at 14:24
Sorry , meant the 1HZJ .
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Follow Up By: Member - Phil G (SA) - Sunday, Mar 29, 2009 at 15:26

Sunday, Mar 29, 2009 at 15:26
The main reason to change oil at 5k is to prevent oil thickening from soot. Toyota service books for many of their diesels say 5k for oil and 10k for filter for this reason. Given I quality of the filters, this doesn't bother me. I often do the same as Tony.
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Follow Up By: Austravel - Sunday, Mar 29, 2009 at 16:19

Sunday, Mar 29, 2009 at 16:19
Patrol 4.2 turbo diesel has 5k oil and 10k filter changes as per book. I do both at 5k but use Z9's as the price is 5 times cheaper. Have also pushed time limits on oil ie take out to 4-5mths as distance not covered. Though have done a few oil tests and all shows ok so feel comfortable in do the above. Have just changed to Delo 400 and about to get another oil test. If it's ok then know that 5-7k oil and filter changes or up to 5mths will be fine.

From memory fuel filters only need 40k change. Changing yearly or 20k is unlikely to have any benefit. If they say 40k then you can back it in they have a good 50;-100% safety factor. Of course all that goes out the window if you get a load of dirty fuel. But that's pretty rare now-a-day.
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Follow Up By: Member - Phil G (SA) - Sunday, Mar 29, 2009 at 22:48

Sunday, Mar 29, 2009 at 22:48
Austravel,
Toyota shifted to dual element bypass filters on the 1Hz (Z334 equivalent). So it catches finer particles and if the element gets blocked or the oil thickens up, the oil can bypass the filter and not compromise lubrication. Thats why I wouldn't use a Z9 on these motors.
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Follow Up By: Member - Doug T (NT) - Monday, Mar 30, 2009 at 02:16

Monday, Mar 30, 2009 at 02:16
Oil change every 10,000k's
Oil filter every 10,000k's
Fuel filter every 15,000k's

Follow this & you will get another 630,000k's

My 1hz now has 735,000+ and I do not need to add oil between changes.

.
still going strong with 836,179 K's

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Follow Up By: Axel [ the real one ] - Monday, Mar 30, 2009 at 09:41

Monday, Mar 30, 2009 at 09:41
Phil G ( sa) , to my mind to put clean / read fresh / oil thru a dirty /read clogged / filter defeats the whole purpose of having a filter , its fair to say that having dirty oil is better than no oil ,, how do YOU know that your filter is on bypass ?? Ergo even a Z9 on a more regular basis HAS to be better than a clogged filter that could be on bypass at 5k and left till 10k ... Ill still stick with my 5 and 5 0il + Filter in the diesel and 10 and 10 in the petrol , ave a good one,,,
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Follow Up By: Member - Phil G (SA) - Monday, Mar 30, 2009 at 10:24

Monday, Mar 30, 2009 at 10:24
Axel,
For a bit of light reading, I posted the Ryco information on the Z334 dual element filter in the Member FileSwap in the "Vehicle Info" folder. Haven't got one for the Z9 unfortunately.
Link.

No oil filter gets clogged in 5000k of normal driving. Oil filter volume may be 500mls and sump capacity of a 1Hz is about 10 litres. Can't see how it would be a problem.

Cheers
Phil
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Follow Up By: Axel [ the real one ] - Monday, Mar 30, 2009 at 10:52

Monday, Mar 30, 2009 at 10:52
Phil , correct that it "probably "is not a problem and the a filter would by rights not be clogged at 5k , however the moment u fit a new filter be it single or double element and presumiably doing its job it stands to reason that its actual performance for want of a better word starts to dimminish as the filter pores clog , , still ,,, each to there own , I still maintain its better , new filter with new oil rather than new oil going thru an old filter ,,,
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