Biodiesel oil changes

Submitted: Wednesday, Apr 19, 2006 at 14:58
ThreadID: 33041 Views:1555 Replies:6 FollowUps:13
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As biodiesel clears the engine of deposits resulting in cleaner oil does any body know if that mean oil changes can be spaced out?

I am currently changing the oil and filters on my 4.2 GQ with 230 000km on the clock every 5000km, what could i expect my intervals to be on biodiesel 20% and 100%?

An oil change costs around the same as a tank of fuel so if i can extend those out to something like 10 000km money saved would be substantial.

Also are the fuel lines on the December 1991 build TD42 likely to be corroded by the biodiesel over time?

Thanks

Barnesy
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Reply By: David from David and Justine Olsen's 4WD Tag-Along - Wednesday, Apr 19, 2006 at 15:39

Wednesday, Apr 19, 2006 at 15:39
Biodiesel cleans the gums from your tank and fuel lines, I would expect gums to be carbonised in the engine so wouldn't expect a big difference to the oil.

I personally wouldn't extend oil changes on a diesel at all, but that's just my choice.

All I have read about biodiesel would indicate your fuel lines will be fine.
AnswerID: 167815

Reply By: Member - Paul P (Bris) - Wednesday, Apr 19, 2006 at 15:49

Wednesday, Apr 19, 2006 at 15:49
G'day

Extension of oil change intervals could be done or not done based on oil sampling.

Regards

Paul
AnswerID: 167819

Follow Up By: Member - Paul P (Bris) - Wednesday, Apr 19, 2006 at 15:50

Wednesday, Apr 19, 2006 at 15:50
ie oil is an oil sample is labarotory tested and oil changes are adjusted on the results.

Paul
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Follow Up By: Member - DOZER- Wednesday, Apr 19, 2006 at 19:30

Wednesday, Apr 19, 2006 at 19:30
second that...the gq is a dirty motor....id say 5000kms on bio is about right...you would be better off fitting a pressure filter/ toilet roll filter if you want to save oil changes....after purchase and instalation, you add 1 litre every 5000 kms as you change the filter element, and change the lot at 60000km intervals there abouts...
Andrew
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Reply By: Truckster (Vic) - Wednesday, Apr 19, 2006 at 15:54

Wednesday, Apr 19, 2006 at 15:54
>>> An oil change costs around the same as a tank of fuel

Your oil change costs $100+? What the bleep oil are you using?
AnswerID: 167822

Follow Up By: Barnesy - Wednesday, Apr 19, 2006 at 16:16

Wednesday, Apr 19, 2006 at 16:16
Around $50-60 for 10 litres of oil, 2 filters at $15 each that's about $80-90. But that's not the question I originally asked Truckster.
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Follow Up By: Member - 'Lucy' - Wednesday, Apr 19, 2006 at 21:24

Wednesday, Apr 19, 2006 at 21:24
Oi! you forgot the 'consumables' at anywhere between $10 - $20
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Follow Up By: Truckster (Vic) - Wednesday, Apr 19, 2006 at 23:57

Wednesday, Apr 19, 2006 at 23:57
i realise that was not your question, but my oil changes on my GQ are never anywhere near $100.00 - EVER......
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Follow Up By: Barnesy - Thursday, Apr 20, 2006 at 04:36

Thursday, Apr 20, 2006 at 04:36
OK Truckster, how much does it cost to do a full oil change and replace the filters on your GQ? how is it cheaper than the way I do it? any money i can save will be accepted.
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Follow Up By: Truckster (Vic) - Thursday, Apr 20, 2006 at 21:22

Thursday, Apr 20, 2006 at 21:22
20 ltr drum of oil from Supercheap Castrol RX Super for ~$40 or less when they have their 25% off sales which I usually go 1/2s with a mate with another GQ, and 2x filters from Nissan at $10ea.
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Follow Up By: Truckster (Vic) - Thursday, Apr 20, 2006 at 21:38

Thursday, Apr 20, 2006 at 21:38
PS. Always buy oil and filters when they have their 25% off sale. Stick it in the shed.
Me and a few mates were going to get a group going and get a 44 of Shell Rimula X, which I think is the best, but they all pulled out the day I called to order it :(
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Reply By: Mr Fawlty - Wednesday, Apr 19, 2006 at 16:43

Wednesday, Apr 19, 2006 at 16:43
Strewth don't start me on oil prices... My Jack has to use a synthetic oil as that seems to be the only oil I can find with a 5 weight ie 5w-30.... Just bought a new 20 litre drum of the stuff at $190... enough for not quite 3 changes...
Repco had a 25% off sale over Easter & I thought there was plenty of Oil in my drum, imagine my horror when the Castrol man hit me with that price. I've tried it on semi synthetic 10w-40 and it works well untill the temperature drops and then it just won't start....Also I have to buy genuine filters but they are reasonable at $26 trade but if the dealer does a simple oil change I have no change from $350....I think the last time I had a dealer do this I was hit $96 for the filter...The change interval is 10,000 km though so I guess I just have to put up with it, great tow vehicle otherwise...
Anyway back on topic... Bio diesel has these cleansing properties which I would imagine to be a good thing does this mean that one may not need to use any anti algie additives?

I wonder if one of those fitchy things would improve things???
AnswerID: 167832

Follow Up By: Barnesy - Wednesday, Apr 19, 2006 at 18:08

Wednesday, Apr 19, 2006 at 18:08
Have only begun researching biodiesel and as it is a natural product, also contains oxygen then algae can grow in the tanks consuming the fuel. It has the cleansing properties as it's a solvent. If I'm wrong then please correct me.

I really want to know about the oil though. My GQ is due for its 5000km change, only 4 weeks after the last one!
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Follow Up By: Michael ( Moss Vale NSW) - Wednesday, Apr 19, 2006 at 21:36

Wednesday, Apr 19, 2006 at 21:36
Like Dozer said, Use a bypass filter and just change the oil every 30, 40,000km, change the filter inside it for about $10 and top up the oil.. especially if you are using synthetic oil.. Michael
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Follow Up By: Member - Royce- Wednesday, Apr 19, 2006 at 23:30

Wednesday, Apr 19, 2006 at 23:30
Diesel made from old forests.... oil.... is probably just as 'natural'. A far as I understand algae can grow in either given the right environment. Not sure why there would be more oxygen in biodiesel to mined diesel.... take your word for it.
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Follow Up By: Barnesy - Thursday, Apr 20, 2006 at 01:31

Thursday, Apr 20, 2006 at 01:31
Royce, have read that biodiesel has a higher oxygen content than straight petroleum diesel and that helps it combust cleaner and more efficiently. Haven't found out why the content is higher as yet but oxygen is highly flammable of course but otherwise safe.

The non-petroleum components of biodiesel are far less toxic, about the same as table salt, and biodegrade at the same rate as sugar.
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Follow Up By: Barnesy - Thursday, Apr 20, 2006 at 01:40

Thursday, Apr 20, 2006 at 01:40
due to the higher oxygen content this also allows microbes to live in the fuel and feed off of the oxygen.
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Reply By: cokeaddict - Wednesday, Apr 19, 2006 at 19:21

Wednesday, Apr 19, 2006 at 19:21
Barnsey,
I have been following the biodiesel forum for a while now, I have used 3 tanks of 100 so far in my GQ. Mine is a 1994 model. So far, fuel filter is still spotless but i carry a spare in car just incase it clogs up.

As for your fuel lines, in theory, you should replace them as most manufacturers started using different hose compositions around 1994. So i would say yours will eventually stuff up. So just change them and save yourself the hassle of one breaking down while your driving.

Some of the administrators in the biodiesel site have been using biodiesel for years, mostly home brewed back then but now most of them buy it in bulk lots between them and share it around depending on how much each member orders. Some of them have also increased their oil changes from 5000 to 10,000 kms without any problems at all. Infact, a few have stated that their engine oil is much cleaner now that they run biodiesel 100.

I can only tell you what i have expierenced with mine, I changed my engine oil 2 weeks ago, It was my first oil change since using 100 biodiesel. The new oil has done approximately 800 kms to date and it is still showing a gold colour on my dipstick. I mention this because as you well know, most diesels would show black oil at the dipstick after a few kms. So from my expierence so far, its all good.
And NO..i wont be changing oil every 10,000 kms just yet. I want to use a few more tanks before i decide to go that path, but im just and lod fart and i like to take precautions, after all...tis GQ is my pride and joy and i intend on keeping it for a long time yet.

I hope this helps mate
Ange
AnswerID: 167874

Reply By: Barnesy - Thursday, Apr 20, 2006 at 02:29

Thursday, Apr 20, 2006 at 02:29
These bypass filters look good. Companies claim they get 100-200 000km without an oil change! I will have a better look at these filters to make a decision but they appear good. Even if the oil is changed every 50 000km then they it would pay for itself very quickly.

Does anybody know where in SA i can get more info on them?
AnswerID: 167975

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