Does anyone know what, if any, type oil the air suspension uses? There is a small plastic screw off cover on top of one of the components of the air suspension on the drivers side wheel well that looks like a place to add/check oil. I did a search, but didn't find anything on this. Any help would be greatly appeciated.

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James Duffey
Atlanta, GA
1963 MGB
1972 300SEL
1980 240D
1989 300SEL
1995 E300D
2000 Audi S4

I think that is for antifreeze (isopropyl alcohol), not oil. Do not use ethylene glycol! The antifreeze is pumped in to prevent condensation from freezing the air lines.

You also need to "blow down" the air tank periodically to remove the antifreeze and residual water -- see other posts on this issue.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

You have to use denatured alcohol. Check out www.m-100.org for info.

Which model 300SEL? 2.8, 3.5, 4.5 or 6.3?

It is a 4.5.

__________________
James Duffey
Atlanta, GA
1963 MGB
1972 300SEL
1980 240D
1989 300SEL
1995 E300D
2000 Audi S4

The caps are there to simply keep it clean, it does not use oil. Then check your alcohol resevoir, install rubbing alcohol, NOT ANTIFREEZE.