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Old 05-13-2003, 02:35   #1 (permalink)
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confused Leaded Petrol Vs. Premium

G'day Guys,

My dad has an 84 LTD, EFI but leaded.
It was suggested to him by someone that its possible for him to use Premium instead of the leaded?

And, they are round about the same price, so if there are benefits when using premium, then why not hey!

Thanks for the help!

Brian
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Old 05-13-2003, 03:27   #2 (permalink)
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From www.mobil.com.au
<b>
Older Cars and Mobil Synergy 8000

Can older cars use Mobil Synergy 8000?

Yes. Many older cars will benefit from the higher octane, the detergency and increased density of Mobil Synergy 8000.

Drivers of some older cars (pre-1986) will need to use an anti-valve seat recession additive in conjunction with Mobil Synergy 8000. This additive is available from Mobil service stations, and is a valve seat lubricant that provides additional protection for soft valve seats. (See in-store guide for information on which vehicles require the additive).

What are the benefits to older cars of Mobil Synergy 8000?

High octane

Many older cars were originally designed to run on higher octane leaded fuels. In the past, these vehicles have been re-tuned to use lower octane fuels with a re******t loss in performance and efficiency. The use of Mobil Synergy 8000 will allow engines to be tuned to the original specifications, with a resulting increase in performance, efficiency and reduced emissions.

High Density

Mobil Synergy 8000 has higher amounts of energy per unit volume of fuel when compared to regular unleaded petrol and therefore can provide improved fuel economy.

Detergency

Mobil Synergy 8000's advanced additive package will effectively clean up and keep clean your engines carburetor or throttle body injection system, intake manifold, intake valves and controls combustion chamber deposits, all of which improves your vehicles idle quality, drivability, acceleration performance, tail pipe emissions and engine efficienc y. </b>
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Old 05-13-2003, 03:36   #3 (permalink)
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You can also buy LRP such as

<b>Shell Lead Free Super
Shell Lead Free Super, assures the same engine protection as leaded fuel while eliminating lead emissions. It's 96 octane rating means you won't lose performance. Lead Free Super contains a pre-mixed additive that protects your engine the same way lead does, without the harmful lead compounds. The additive Shell uses is Valvemaster which protects wearing on the soft valve seats of older cars (pre-1986). Post-1986 cars have hardened valve seats and do not need leaded petrol.

Now you can purchase Valvemaster off the shelf which means you can use Shell Optimax and still protect the valve seats in your engine. </b>

and the Mobil Equivalent

<b>Mobil Synergy Lrp is a high octane (96 RON) fuel that provides a seamless transition from leaded to lead-free petrol. This is achieved by additive technology that protects soft exhaust valve seats through 'solid lubrication', giving you many years of motoring enjoyment, while also being kinder to the environment. And best of all, as with all fuels in the Mobil Synergy Fuel System, comes the satisfaction of knowing you've made the right choice. </b>

The LRP Fuels are 96 Ron as opposed to 98 Ron for Optimax, Ultimate and S8000. And contain the additives that you may or may not need to add if using Straight Premium.
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Old 05-13-2003, 03:45   #4 (permalink)
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Old 05-13-2003, 04:57   #5 (permalink)
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I personally wouldnt touch the LRP,go for premium and use a good subtiute valve lub,or even better get it built for unleaded.
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Old 05-13-2003, 15:57   #6 (permalink)
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Shell lead free super is the way to go. If it contains that Valvemaster stuff, it will be good.

Or you could use the high octane stuff and add the valvemaster yourself, at least you know what you are putting in - not that I don't trust what's in servo holding tanks :)

http://www.valvemaster.com.au/Win_ie/why.html

Valvemaster has been tested in the UK on a lot of older engines has been proved by engine dis-assembly to retard valve seat erosion. I didn't know Shell sold it off the shelf, but that is one additive I would use in an engine.
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