農用エンジンオイルの研究 (第2報)

空冷および水冷ディーゼルエンジンにおけるオイルの劣化について

抄録

In bulldozer (Water cooled 4cycle Diesel engine), the time of exchanging oil was about every 120 hours.
But, when Series-3 oil was used with an engine of good condition, the exchange of oil could be extended to every 150 hours.