Entrevista del año 1996 con los ingenieros de GETRAG, fabricante de la caja de cambios de las boxer de la época, Klaus Sommer y Eberhard Schaetzle:
"MO: What kind of oil recommendation for the BMW transmission can you give us?
SCHAETZLE: Oil should be seen as an integral part of the transmission. When designing the transmission the load bearing capability of the oil is part of the calculation. We fill the BMW transmissions with SAE 90 GL 5 gear oil manufactured by Fuchs, a brand mainly found as an OEM supplier.
SOMMER: SAE 90-Oil should be used throughout the whole year. It is true that in winter the shifting will suffer at first from the thick oil, but it should improve during a very short ride. For those to whom this is disturbing, because they make many short trips, for example, can use 75w90 GL 5 in winter as an alternative. In summer it must be changed back to SAE 90 GL 5.
MO: How do you regard oil additives?
SCHAETZLE: Oil additives are always factors which cannot be taken into account when designing and building a transmission. In the best case they don't do any harm. For example, it has not been researched yet how oil additives might react with the new "clean bearings". We therefore rigorously recommend against their use, especially in automotive transmissions. Synchro rings, for example, function only if they can exert some braking effect on the gear wheels. Special extra-slippery additives can result in big damages. "
Dejarse pues de líos, y en ambiente del sur SAE90 GL5, y si os toca inviernos fríos SAE 75W90 GL5.
Manuel
"MO: What kind of oil recommendation for the BMW transmission can you give us?
SCHAETZLE: Oil should be seen as an integral part of the transmission. When designing the transmission the load bearing capability of the oil is part of the calculation. We fill the BMW transmissions with SAE 90 GL 5 gear oil manufactured by Fuchs, a brand mainly found as an OEM supplier.
SOMMER: SAE 90-Oil should be used throughout the whole year. It is true that in winter the shifting will suffer at first from the thick oil, but it should improve during a very short ride. For those to whom this is disturbing, because they make many short trips, for example, can use 75w90 GL 5 in winter as an alternative. In summer it must be changed back to SAE 90 GL 5.
MO: How do you regard oil additives?
SCHAETZLE: Oil additives are always factors which cannot be taken into account when designing and building a transmission. In the best case they don't do any harm. For example, it has not been researched yet how oil additives might react with the new "clean bearings". We therefore rigorously recommend against their use, especially in automotive transmissions. Synchro rings, for example, function only if they can exert some braking effect on the gear wheels. Special extra-slippery additives can result in big damages. "
Dejarse pues de líos, y en ambiente del sur SAE90 GL5, y si os toca inviernos fríos SAE 75W90 GL5.
Manuel