Fuel Increase 95 vs 93

Because people fill up with 95 when they really do not have to. The price difference was there historically to discourage people from using higher octane when they don't need it. The difference is also only a levi, so only the government scores in this case...

A basic guideline: if you are at the reef, and your engine does not have a turbo and your compression ratio is less than 12:1, you don't need 95.
 
Yeah unfortunately a lot of people tend to think that a higher octane fuel will give them more performance.
 
P924 said:
A basic guideline: if you are at the reef, and your engine does not have a turbo and your compression ratio is less than 12:1, you don't need 95.
Click to expand...

This is untrue. Many N/A newer tech engines require 95 octane because of the lower contaminate content(yes this not only diesel thing )

Check your car manual and use the appropriate grade fuel.

Older cars are more likely to be okay with 93 ron.
 
silver6933 said:
This is untrue. Many N/A newer tech engines require 95 octane because of the lower contaminate content(yes this not only diesel thing )

Check your car manual and use the appropriate grade fuel.

Older cars are more likely to be okay with 93 ron.
Click to expand...

I'm not sure where you get this info from?

Besides that, newer diesel cars actually will run longer on higher sulfur fuel (as long as it is of the same quality), it is only the DPF that will fail (and it won't pass emissions testing in the EU).
 
silver6933 said:
This is untrue. Many N/A newer tech engines require 95 octane because of the lower contaminate content(yes this not only diesel thing )

Check your car manual and use the appropriate grade fuel.

Older cars are more likely to be okay with 93 ron.
Click to expand...

This ^^^
 
There's no "contaminate" difference between 93 and 95.

Also, the higher sulphur content of the fuel affects oil longevity, not the DPF. The DPF is affected by ash content, and soot from incomplete combustion.
 
Just read the damn car manual and put in the right fuel.
 
silver6933 said:
This is untrue. Many N/A newer tech engines require 95 octane because of the lower contaminate content(yes this not only diesel thing )

Check your car manual and use the appropriate grade fuel.

Older cars are more likely to be okay with 93 ron.
Click to expand...
You are confusing Leaded and Unleaded petrol.

Older cars run better on Leaded (LRP) fuel, whilst the new ones all need to run on Unleaded which is 95 at the Coast and 93 inland. Even if the manual says 98, you aren't going to get it in SA, and those cars are tuned accordingly in SA.

So let's just make this clear:

LRP 93 or 95 for OLDER cars roughly 1990 backwards.

UNLEADED 93 or 95 for all modern cars.
 
93 ULP and 95 ULP is available in GP

BP 98 octane race fuel is available directly from BP drakensberg in 20L tins or at many racetracks in GP.

My Subaru owners manual says 95ulp min recommended.

It sure was nice when Engen 97 ulp was available in KZN at the pumps.

Right now I use 95ulp on my 3 N/A cars and on my modded turbocharged scoob 95+NF+Water injection.

BTW 93 ron on my Renault N/A gave me much worse fuel usage.

Nice read http://www.carbibles.com/fuel_engine_bible_pg3.html

I have yet to see a SA printed owners manual that states 98 ron.

As I said, Use the grade specified by the manufacturer.
 
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Yes, I actually have to put a sticker inside the fuel flap of every Subaru that I deliver, that says 95 ULP only.
 
I use 93 Unleaded on my 2000 Jeep Grand Cherokee Limited 4.0L I6, it's N/A, no problems so far, is it bad to alternate and mix 93 and 95?
 
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