17-01-2024, 02:37 PM
From a number of sources I have found that the 91 we have in Australia is pretty marginal compared to the 90 that was originally specified back when they were produced. A number of my mechanics recommend 95 at least even if listed as 91 compatible as they can tell the difference, with amongst other signs in particular spark plug life is close to half using 91.
95 is a better quality fuel with better additives in general and if you aren't using your bus for long periods of time is much more stable when left in the tank. For a few extra cents a litre I use it in all my petrol powered items inc lawn mowers, outboards etc. It sits around for months often and I always get a first pull start on everything, when the 91 in my fathers laws gear is very hit and miss after a week or so. Mileage on 95 (if you are tuned well) can be more than a litre per 100 km better than 91.
98 for higher compression engines is good, but if you aren't getting it from a high volume servo it effectively degrades to 95 level once it has been in the tanks for a few weeks. And if you are running a standard engine you wont get any noticeable difference over 95.
Really is a experiment yourself to see what's best but running a better grade wont make things worse, just lighten you wallet to varying degrees.
Adrian
95 is a better quality fuel with better additives in general and if you aren't using your bus for long periods of time is much more stable when left in the tank. For a few extra cents a litre I use it in all my petrol powered items inc lawn mowers, outboards etc. It sits around for months often and I always get a first pull start on everything, when the 91 in my fathers laws gear is very hit and miss after a week or so. Mileage on 95 (if you are tuned well) can be more than a litre per 100 km better than 91.
98 for higher compression engines is good, but if you aren't getting it from a high volume servo it effectively degrades to 95 level once it has been in the tanks for a few weeks. And if you are running a standard engine you wont get any noticeable difference over 95.
Really is a experiment yourself to see what's best but running a better grade wont make things worse, just lighten you wallet to varying degrees.
Adrian
A new beginning. 
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1975 Kombi The Doctor
1976 Dual Cab Bumble Bee
1974 Microbus Matilda (parts bus)
+1975 Kombi The Doctor
1976 Dual Cab Bumble Bee
1974 Microbus Matilda (parts bus)