More questions back from different forums.

TECHNICAL QUESTIONS FROM THE FORUMS:

Antilag:

Which Castrol engine oil should I use with Ethanol or E85 fuels? I?m currently running Castrol R - 10w-60.

Fuel trials carried out overseas have indicated no reason to change any of our current formulations/products.
Also V8 Supercars in 2009 ran E85 and there was not change to the oils supplied to our sponsored vehicles

Australian Speedway:

Will Castrol release a range of racing oils with the zinc additive that they've removed? Castrol are losing a lot of sales to Joe Gibbs and Brad Penn.
I don?t understand why you believe that we have removed the zinc additive from our engine oils because we haven?t. Our zinc additives have improved over the years and their concentration hasn?t reduced in the majority of our oils.
Be careful when comparing Castrol oils with others especially from the USA. USA formulations that meet API SM may also meet ILSAC GF4 (a fuel efficiency spec with chemical limits for additives like Zinc & Phosphorus). Even though our products meet API SM, most exceed the chemical limits required for ILSAC GF4. Our Edge Sport 25W/50 still has Zinc levels in excess of 1000 ppm.
What is the best Castrol oil to run in a car type engine running methanol?
Edge Sport 25W/50

Aus Jeep Offroad:
What gear oil would you recommend for use in diffs with ARB diff lockers that are mostly used on road, but when off-road they work pretty hard?
ARB diff lockers do not require the use of specific type lubricants. As such, you should use the diff oil recommended for your vehicles normal diff before fitting the air locker.
If however a LSD oil is specified by your manufacturer, then a non-LSD oil equivalent would also be suitable. In the case of LSX 90, use EPX 80W/90. In the case of LSX 85W/140, use EPX 85W/140.
If a synthetic oil is specified (like in many Jeeps), then a synthetic oil should be used.


Australia4WD:

I'm a bit confused; the online lube guide recommends GTX3 or Magnetic for my DMax. Why not GTX DIESEL? Double checked the rodeo and Colorado and all the same... The service guide also has 10,000kms oil changes - is there a benefit in a modern diesel of reducing to 5000kms?
All 3 oils meet the oils specs for that 4JJ1-tc engine fitted to those vehicles. So, GTX Diesel is equally suitable.
More regular servicing on any engine should essentially extend engine life. Soot produced by burning diesel fuel is an abrasive by-product that contributes to engine wear. Replacing the oil more often will reduce soot build-up related engine wear. It is particularly important to change the oil more often if you have been doing long 4WD work.

Fordmods:

Does Castrol offer a supercharger oil suitable for M90/112 as fitted to super6 commodores and TRD Aurions? If so, who in Perth WA would be distributing it?
Unfortunately Holden nor Toyota publish generic oil specs for the superchargers, so we are unable to offer an equivqlent. However Syntrans 75W/85 has proven quite good in racing applications.
I have religiously used Magnatec in my Ford (and Holdens) over the years. Prior to each change I normally run Nulon Engine Oil flush to thin the oil out and clean the engine free of gunk. Would this affect the Magnatec properties at all with protection to my engine?
When a quality oil is used and it is changed in accordance with the car manufacturers recommended service periods, we do not see a need for an engine flush. That is why we do not retail such products.
Provided the oil filter is changed after the flush, there is only a small amount of residue in the engine, we would not expect Magnatec?s protective properties to be affected.


Fullboost:

Does Castrol produce any non-API motorsport/offroad specific racing motor oils with high Zinc content?
Castrol has not dropped the level of zinc in our oils.
The majority if Castrol engine oils still contain relatively high levels of zinc. Edge Sport 25W/50 & 10W/60 have high levels of zinc suitable for older high performance cams & flat tappets. If you are running a V8 with 2 valve per cylinder & roller followers OR tappets, Edge Sport 25W/50 should be used.

JDMST:

I have been using Edge 0w-40 in my Golf GTI but it's been burning some oil and after a few top ups I went out. I have a spare bottle of 5w30 sitting in my garage and I just wonder if it?s ok if I use this to top up say <1L?
Firstly, what year & engine does the Golf have.
Secondly, Edge 0W/40 is no longer available. It has been replaced by Edge Sport 0W/40 for most models.
Thirdly, additions of a thinner oil, like 5W/30, could possibly contribute to further oil consumption, depending on how much is added.

Whats the best oil for Honda type s dc5.
Assuming your engine is in good condition, Edge Sport 5W/30, 0W/40 or Magnatec should be suitable. If your engine uses much oil, we may recommend a heavier grade.

Opelaus:

Is the 0W-40 really "not as good as" 5W-30 when it comes to turbo engines? I want to start using 0W-40 again, but the last thing I want to happen is the more expensive oil is stuffed because of the turbo temp.
Edge Sport 0W/40 offers superior performance to Edge Sport 5W/30 in all applications and especially in turbos.
I have been using Castrol Edge 0W-40 for all my previous cars. I currently use 5W-30 for my 1995 Calibra Turbo because of the explicit statement "been tested to withstand scorching turbo temperature". I personally prefer 0W-40, as my experience has been great (less noisy, feels lighter etc), and I assume older cars prefer slightly thicker oil anyway. QUESTION: Is the 0W-40 really "not as good as" 5W-30 when it comes to turbo engines? I want to start using 0W-40 again, but the last thing i want to happen is the more expensive oil is stuffed because of the turbo temp.

Edge Sport 0W/40 is every bit as good as the 5W/30.
Both are high performance synthetic oils with differences in viscosity and formal approvals.
I see no reason why the Edge Sport 0W/40 will not work as well as the 5W/30 in the Calibra turbo.

I have been using sogui s 6000, and am very disappointed with it for the price. It looked 'dirty' at 3000km, other oils I have used haven?t looked 'dirty' till 8 or 9000km what would you recommend instead? (1995 Holden calibre - car has 130,000km)

Edge Sport 0W/40 for a standard engine used on the road OR Edge Sport 10W/60 if the engine has been modified for track work or high speed driving.

SupraForum:

I have just started running your 10w-60 in my jza80 supra NA-T(turbo). It is primarily a "weekends only" street car that is driven once or twice a month and with a few track days thrown in for good measure. I have typically changed my oil every 5000kms and the oil filter every 10000kms when using mineral oil. What would you suggest is a good interval for changing the 10w-60? Its $100 a bottle here so I want to make sure I?m not throwing money down the drain so to speak, by draining it too early.

I'd like to see a comparison between 300v (what I use in my car) and Edge (what I used to use in my old cars)
Firstly, what type of comparison are you after? Wear rates, dyno horsepower, fuel consumption, ???etc. Are you aware of the costs of such tests?
Secondly, comparing 2 different oil in 2 different cars is meaningless. Not sure what comparisons can be made here.
Thirdly, which of the 4 Edge variants are you enquiring about? None of them are ester based oils like the Motul product.


Pulsar:

Why dont you make a Full Synthetic 10W-40 oil?? I have used your 10W-60 before and my car did not like it as it was too thick I put 10W-40 back into it and it was much better.
Edge Sport 0W/40 is the only SAE 40 engine oil that we have.
It has the same SAE 40 rating that you are after, with a much better cold cranking viscosity of 0W compared to 10W.
Magnatec ( a semi-synthetic product) fits your requirement of 10W/40.
Is there a reasoning why you have not considered Magnatec??

What temp does the Edge 0W-40 break down at? and also what temp does the 10W-60 break down at?

For both oils, a continuous temperature in excess of 120 oC will increase the rate of oil oxidation, leading to oil thickening & loss of film strength.

Prelude:

I was wondering if you could recommend an oil for breaking in a brand new engine? Are there any reasons why I would go for a specific grade of oil for this process? The engine is a 10:1 compression 2.3 litre turbo.
Mineral oils are recommended for running in new engines.
Would recommend Castrol GTX 3 15W/40.
What oil is best for the H22a ? I am using Honda FEO oil for it now but its getting low and I need a oil change, what?s a better oil to use?
Edge Sport 0W/40 or Magnatec would be suitable.

Is 5w-30 EDGE ok to use in a h22a4 with 200,000+ km? 10w-40 synthetic has been good for the last few months but I?m afraid I?ll burn the 5w-30 too fast.
Depending on engine condition & service history, the Edge Sport 5W/30 might be a little thin. However I would expect little if any change using Edge Sport 5W/30 compared to Magnatec 10W/40.