OK, from that first link I posted, here's the info on oil Detroit published.
No difference in oil requirements for any of the two cycles, 53, 71, and 92 series all use the same stuff.
2.2 TWO-STROKE CYCLE ENGINES
The lubricating oil requirements for On-Highway applications of Series 53, Series 71, and Series 92 two-stoke engines are outlined in this section.
SAE Viscosity Grade: 40
API Classification: CF-2
Lubricating oil for On-Highway applications for two-stroke cycle engines must meet the
following requirements:
□ 1.0% Ash Maximum as measured by ASTM D 874
□ 7.0 TBN minimum as measured by ASTM D 2896
□ 700 ppm zinc minimum as measured by ASTM D 5185
At ambient temperatures below freezing (0°C [32°F]), sufficient starter cranking speed may not be achieved to start the engine with SAE 40 grade oils. Where starting aids are not available or at very cold temperatures (-18 to -32°C [0 to -25°F]) even if starting aids are available, the use of multigrade SAE 15W-40 or monograde lubricant SAE 30 will improve startability. These lubricants must possess a HT/HS Viscosity (measured by ASTM D 4741 or equivalent) of 3.7 cP minimum. These oils must be replaced with monograde SAE 40 lubricants as soon as ambient conditions permit.
and here's where to find the most up to date info
http://www.mtu-online.com/fileadmin/fm-dam/mtu-global/pdf/valuecare/A001061_34E.pdfAgain, the answer is straight weight oil in most all cases.
Grigg
