Quote Originally Posted by Phased View Post
In order for me to take your comment even remotely seriously, you have to have some foundation...

- How do you "know" Nulon is better than Castrol Edge for a fact? Because of a bias oil test done by somebody in Australia sponsored by Nulon?!?!?! Show me Independent Oil Analysis'!!! The only two oil analysis' of Nulon I have seen, showed that they have high levels (close to legal limit) of Phosphorus slightly lowering cylinder head wear in certain engines. This however will contribute to higher emissions and lower catalytic converter life. Other than that in a Four Ball Wear test the Nulon was far behind even the Group III PENNZOIL PLATINUM.

- You shouldn't be comparing different viscosity oils... (Castrol Edge 5w30, Nulon 5w40)

- By definition regardless of wear or friction additives a 40 weight oil will give higher fuel consumption at operating temperature.

- The further apart the viscosity index (5w40 vs. 5w30) in a Group III (Mineral) oil the greater amount of viscosity modifiers are required which will have adverse effect on friction and wear. This isn't held true in oils like AMSOIL, Royal Purple, Motul as a fully synthetic oil (PAO/ESTER) are 'naturally' multi-viscosity oils.

- Nulon has a higher pour point which indicates poorer cold start and flow characteristics... Which is when the most engine wear is caused.

- Nulon only contains a minimum of 60% Group III "Synthetic Oil" the rest is mineral oil and additives. Castrol Edge contains a minimum of 70% Group III Base Stock.

You seem to be very stuck to the point it's Australian, I can 100% understand what your saying about supporting Australia. However, until we create something that is actually the same or better than competitors products (even if its slightly more expensive) I will stick to better products.

If I had a "sportier" car and drove hard I would be using AMSOIL no questions. However, Changing at 5000kms becomes expensive. I just changed out my first lot of Castrol Edge and am sending some FEO, Castrol Edge 5w30 and AMSOIL 5w30 away for Oil Analysis.

I would try Nulon, however I've seen Oil Analysis out of a K20A and it wasn't fantastic. It was compared to Mobil 1, Castrol Edge and Elf 5w30's. Nulon is just another Group III.
So do you think I'm wasting my time on Nulon "fully Synth" 10w40? I decided to change to synthetic at 168,000Km on my b16a2 (11,000 kms and 2oil changes ago. The reason I got it in the 1st place is the local Supercheap/Repco didn't stock anything better and synthetic at that viscosity. Autobarn, who have a wide selection are over 25 Kms away. I wasn't goin to buy castrol as didn't want to risk getting something so light as 5w30 incase I developed leaks on my higher mileage engine.

I drive my car reasonably hard and usually shift at 4krpm. Of course the oil is changed no more than say every 5-6,000kms.

I would like to switch to motul, but I've heard that its not a good idea to change brands too often. Besides, Nulon are pretty price competetive
( and I can get it around the corner from my house.) Furthermore, like I've stated before, the engine seems to run well, and oil consumption and fuel economy is no more than when I used mineral FEO.

I would like to hear your opinions, not just from Phased, but from some OH veterans.

Don't flame me for my naivety as I'm not an oil specialist,

MikeCivic