av oil/gas in your car
Join Date: Nov 2003
Location: Tasmania and High Wollemi
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Fuel and oil.
Without showing my age in australia...
the old 80/87 was about the equivalent of standard mogas and went well with older engines lower compression engines as the lead stopped the valves recessing themselves into the head. Don't believe this is available any more. Ideal for austers, massey ferguson's and early landrovers
100/130 has a nasty effect in some engines of fouling the plugs with lead globules so 100 LL is generally better in auto engines without a catalytic converter. Also goes well in petrol engined ag loaders eg internationals and even blitz's. The higher octane rating allows a higher boost or compression without detonating. Goes well in the V8 intercepter.
130/145 aka purple power. Not available any more at least since the neptunes retired. Great stuff and allowed very high boost settings or compressions for unblown motors.
Oil's
Don't use w100 or anything with a detergent in it in an old engine. It removes all the gunge inside the engine and generally will increase oil consumption very quickly. I think the red band used for running in piston engines is non detergent ie straight mineral oil.
Jet A.
Very useful when a percentage of biodiesel is added as a lubricant to replace diesel. Can also be used in conjunction with straight vegetable oil when filtered in warmer climates as a straight swap for diesel.
The Eye.
the old 80/87 was about the equivalent of standard mogas and went well with older engines lower compression engines as the lead stopped the valves recessing themselves into the head. Don't believe this is available any more. Ideal for austers, massey ferguson's and early landrovers
100/130 has a nasty effect in some engines of fouling the plugs with lead globules so 100 LL is generally better in auto engines without a catalytic converter. Also goes well in petrol engined ag loaders eg internationals and even blitz's. The higher octane rating allows a higher boost or compression without detonating. Goes well in the V8 intercepter.
130/145 aka purple power. Not available any more at least since the neptunes retired. Great stuff and allowed very high boost settings or compressions for unblown motors.
Oil's
Don't use w100 or anything with a detergent in it in an old engine. It removes all the gunge inside the engine and generally will increase oil consumption very quickly. I think the red band used for running in piston engines is non detergent ie straight mineral oil.
Jet A.
Very useful when a percentage of biodiesel is added as a lubricant to replace diesel. Can also be used in conjunction with straight vegetable oil when filtered in warmer climates as a straight swap for diesel.
The Eye.
Chief Tardis Technician
Join Date: Jan 2001
Location: Western Australia S31.715 E115.737
Age: 71
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Did both in a previous life, in a falcon 4.1L inline 6. As it was a high compression engine, it burnt the avgas like a dream, the engine purred like a kitten, even in Melbournea ner freezing winter. The oil got very thick when cold, so the engine was a little lumpy until the car warmed up a bit. It was good for engines with worn rings, but is not a good long term solution.
Avoid imitations
Join Date: Nov 2000
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Prolly all need a new catalytic convertor, too. 
Join Date: Mar 2008
Location: England... what's left of it...
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I used Avgas often in the 80s and 90s in a few race and rally cars. It gave fantastic results, high power with high compression ratios, good burn characteristics, good resistance to detonation/pinking (in fact, none) and very kind to the head chambers, valves and pistons. The engines felt fantastic on it.
A friend who was a research chemist for Shell at the time had some tested for me. I think he averaged the MON & RON testing methods, and the result was a solid 104 octane, pre-LL. The 100LL measured over 100 too. It was liquid gold for performance car engines. The stuff sold at the pumps now, even the very expensive "high performance" brands, is like water, and it's getting worse.
A friend who was a research chemist for Shell at the time had some tested for me. I think he averaged the MON & RON testing methods, and the result was a solid 104 octane, pre-LL. The 100LL measured over 100 too. It was liquid gold for performance car engines. The stuff sold at the pumps now, even the very expensive "high performance" brands, is like water, and it's getting worse.
