• It seems the most similar to Isoflex PDP 40 is Aeroshell Turbine Oil 500 (viscosity 23 mm2/s), Isoflex is very timid in their references to plastics but it seems all synthetic ester oils are bad for plastics.
• It seems the most similar to Shell Clavus 17 is Mobil Velocite #10 (22 mm2/s viscosity)
• The 1229 motor has 2 felt washers, not sure the effects of the Aeroshell on those. There seems not to be plastic parts near the motor.
• Since Isoflex mentions that "ISOFLEX PDP oils are miscible with mineral oils. However, we recommend removing the used oil from the lubrication point in order to fully utilize the performance of these oils" I will choose Velocite.
Klueber Isoflex PDP 40:
Type : Ester Oil
Service temp : -50 to 100 C
Density : 0.92 g/cm3 at 20 C
Viscosity : 19.0 mm2/s at 40 C and 5.0 mm2/s at 100 C
ISOFLEX PDP oils are synthetic long-term oils based on ester oil. They show a good viscosity-temperature behavior, a high flash point, a low pour point, good aging and oxidation stability as well as corrosion protection. Compared to mineral oils, they hardly change their viscosity at low or high temperatures thus ensuring less decrease in performance and reduced power consumption.
Benefits for your application
• Synthetic long-term oils
• Wide service temperature range
• Low pour point
• Good viscosity-temperature behavior.
• Oxidation and aging stability
• Good corrosion protection
There is no data regarding plastics, they only mention this in the specs:
ISOFLEX PDP oils are neutral towards metals. Due to the great variety of different elastomers and plastics, their compatibility with these oils has to be checked prior to series application.
ISOFLEX PDP oils are miscible with mineral oils. However, we recommend removing the used oil from the lubrication point in order to fully utilize the performance of these oils."
Shell Clavus 17:
The Dual 10xx series used Shell Clavus 17 before Dual changed to the Isoflex, the specs for Clavus are:
• High quality base oils
• Shell Clavus are high quality, naphthenic mineral oils without additives.
• Very good stability, The specific selection of the base oils provides in very good chemical stability in contact with ammonia as refrigerant, very good oxidative stability and in good thermal stability.
• Viscosity at 40C : 17 mm2/s
• It seems the 17 version is discontinued, these are the ones provided now:
• Dualcan said that:
"Since my stock of isoflex is depleted, I returned to the previous motor oil uses by Dual, which is Shell clavus 17. This is in the same viscosity range but is a mineral oil". For a good overview of oil types this could be helpful:http://www.machinerylubrication.com/Rea
If changing oil types, it is imperative to clean the sintered brass bushings on top and bottom- thoroughly. I place these into lacquer thinner to make sure they are clean before applying a different oil; and yes, latex gloves are very good to avoid body acid contamination of the drive parts-including belts, idlers etc."
Pasted from <https://www.vinylengine.com/turntable_forum/viewtopic.php?f=37&t=81692>
• Many turntables notably Technics SL1200 use Anderol 500 for their bearings however this has a viscosity of 100 therefore not suitable or not comparable to replace Isoflex PDP.
• There is Mobil Sintered Bearing Oil but they start at viscosity 32 mm2/s
• Amsoil Compressor Oil has also been suggested but it also starts at 32 mm2/s