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Moss Motors sells a little bottle (125ml - half a cup!)
of Dash Pot Oil for $8.95USD.
That's $286.40 per U.S. gallon! You thought petrol was expensive!
I looked for alternatives and hit upon Compressor Oil as a readily
available single grade oil.
Compressor Oil has an ISO ratings: - ISO 32/46/68/100/150/220 equivalent
to SAE 15W/20W/20W/30W/40W/50W respectively. Both ISO 46 and 68 fall
in the SAE 20W range, with 46 being at the low end of the 20W range
and 68 at the high end.
See http://www.synlube.com/viscosit.htm#Viscosity%20Comparison%20Table
I have used ISO 68 (20W) in the Dash Pots of my 1951 TD for several
years now without ill effect. Available at Canadian Tire for $3.99Cdn
per litre (about $16.00 per U.S. gallon!), and anywhere else that sells
compressors and supplies.
I would be interested in alternatives if anyone wants to chip in. Also,
does anyone think that this stuff could be used as shock absorber fluid
in Girlings and Armstrongs? Is that feasible? Would it be more economic
than motorcycle tube oil? I'll modify this if I get any responses.
Bob Mills says "I've used Singer sewing machine oil for at least
25 years in my TD dash pots......and it works just fine."
2005.08.20
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