Synthetic Vs Mineral oil

Submitted: Thursday, Mar 06, 2008 at 17:03
ThreadID: 55252 Views:4542 Replies:7 FollowUps:4
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I am considering using synthetic engine oil in my 2004 V8 petrol/LPG Landcruiser.

Are there any benefits or disadvantages in doing so. Also what about using in diff, transfer case and maybe gearbox?

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Reply By: howesy - Thursday, Mar 06, 2008 at 17:32

Thursday, Mar 06, 2008 at 17:32
just like starting a thread on tyres , there are strong opinions on both sides. My personal thing is I use nothing but full synthetic in transmissions of any type but in engines I use semi synthetic especially if the motor has roller rockers. Crane even recommend not using full synthetic with theirs as it's too slippery and the rollers may not roll properly with high poundage.

Like I said heaps of differing opinions and I don't think anyone is absolutely proven right.
AnswerID: 291185

Reply By: Member - Adam S (SA) - Thursday, Mar 06, 2008 at 18:05

Thursday, Mar 06, 2008 at 18:05
Like Howesy said many different opinions, but not many based on facts.

I wouldn't have any idea when it comes to 4wd, as I don;t know anyone who rebuilds them after every oil change.

What I do know is when I was involved with bike racing, as long as you used a good oil, what was more important was the interval between changes.

They say synthetic would last longer but it was a lot more expensive.

So basically I haven't helped much, I say use a good oil, and change regularly


AnswerID: 291197

Follow Up By: Member - Adam S (SA) - Thursday, Mar 06, 2008 at 18:22

Thursday, Mar 06, 2008 at 18:22
Just to make it clear I would definitely not use synthetic to bed rings in, or run in.
FollowupID: 556587

Reply By: Member - Axle - Thursday, Mar 06, 2008 at 19:38

Thursday, Mar 06, 2008 at 19:38
Normglenda, Have used mobil one synthetic in a subaru liberty for ten years, it only does short running , and the oil is changed every ten thousand ks, The tappet covers were lifted off it the other day for gasket replacement, and i have never seen such a clean motor internaly as that!!. not a sign of carbon or sludge anywhere. At 220 thousand ks i though that was good recomendation for synthetic oil in good quality petrol engines.

Cheers Axle.
AnswerID: 291215

Reply By: Member - DOZER- Thursday, Mar 06, 2008 at 20:13

Thursday, Mar 06, 2008 at 20:13
You get what you pay for, and if synthetic is slipprier than normal oil, that means the motor will use less fuel to make thesame amount of power...we may only be talking 1%, but in 10000kms, thats 100kms of fuel usage you would save...not to mention the extra protection synthetic offers...i used it in my 4.5 cruiser, and justified it by only changing it once a year, or 10,000kms, so less maintenance and oil filters/ made sense to me
AnswerID: 291225

Reply By: Member - Bushpig - Thursday, Mar 06, 2008 at 21:03

Thursday, Mar 06, 2008 at 21:03
My Misses has a Mercedes Vito Diesel and uses 0w40 Mobil synth and the recommended change interval is 20,000 0r 12 months. Runs very well and fuel economy is 8lts per 100kms.

Sump holds $200 worth of oil!!!

AnswerID: 291244

Reply By: Member - Davidp P (VIC) - Thursday, Mar 06, 2008 at 22:14

Thursday, Mar 06, 2008 at 22:14
Synthetic reduces fuel consuption when used in the the diffs at least that was obvious to me when I put 75W90 Penrite in my Wrangler diffs. the way Penrite sell a full synthetic diesel oil - 5W40 in 10L pack for 78AUD there would be a petrol equivalent which if most of yr driving is on LPG would be worth considering as it doesnt dirty the oil at the same rate as petrol. If you ever get a turbo diesel no question SYNTHETIC.....silverback
AnswerID: 291273

Follow Up By: jeepthing - Friday, Mar 07, 2008 at 09:59

Friday, Mar 07, 2008 at 09:59
As far as I'm concerned comparing Synthetic and Mineral Oil is like comparing apples and oranges, Synthetic is far superior. If you buy fully synthetic in 20l drums through your preferred oil company you will find it is much cheaper then buying it through Supercheap, Repco etc and through your service dealer. I do my own oil changes but most dealers will use your preferred oil if you supply it, you'll save yourself some $ as well.

I use Mobil 1 5w 30 ESP in my turbo diesel which is the preferred oil as specified by Jeep and Merc. Costs me just under $200 for 20l drum which works out at $48 for 5l, the sump holds 9.5l. I can't get this oil in 5l containers but if you price Mobil 1 in 5w 40 or 0w 40 it works out at around 100 for 5l.

What you are paying for the Penrite is a pretty good price David...I use to use Castrol 5w 30 The Edge and I think it was up around that price for 5l.
FollowupID: 556718

Follow Up By: Paul & Debbie - Friday, Mar 07, 2008 at 13:45

Friday, Mar 07, 2008 at 13:45
$200 for 20 litres equals $50 for 5 litres.
Do you give yourself a discount?

Just wondering, nothing serious.


FollowupID: 556754

Follow Up By: jeepthing - Friday, Mar 07, 2008 at 20:17

Friday, Mar 07, 2008 at 20:17
I should have got the invoice/receipt shouldn't I...but I did say under $200 :)) Cost me $195.96 to be precise $48.99 for 5 litres.
FollowupID: 556817

Reply By: blown4by - Friday, Mar 07, 2008 at 23:18

Friday, Mar 07, 2008 at 23:18
I use fully synthetic oils in the diffs (Mobillube SHC ID), transfer case, auto trans, power steering (Mobil 1 Synthetic ATF) and semi-synthetic (Mobil Synth S 15W-40) in the engine on my Patrol and stick to the Nissan oil change recommended intervals although I could safely extend them. It comes down to how long you plan to keep the vehicle and the main benefit is cooler running, better lubrication across a higher ambient temperature range from minimum to maximum, less oil degradation due to high temperatures = cleaner internal components, less viscosity degradation at high temps, smoother transmission shift quality, less friction = less wear and better fuel economy although you could probably buy a lot of fuel for the extra cost of the oils over mineral based oil. I agree with the comment to buy it from an oil Comapny in bulk and all at the same time and you will acheive a better price advantage than at the auto chain stores. The comparison between mineral and synthetic is a "no brainer" really.
AnswerID: 291504

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