quote:
3. For continuous high temperature operation (over 200 F or 94 C coolant out), the use
of an SAE grade 50 lubricant in DDC two-stroke cycle Series 53, 71 and 92 engines is
required. SAE grade 50 lubricants are also required for all Series 149 engines where
ambient temperatures are above 95 F (35 C).
4. At ambient temperatures below freezing (32 F or 0 C), 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 (0 F to -25 F or -18 C to -32 C) 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 High Temperature
– High Shear Rate Viscosity (measured by ASTM D 4741 or equivalent) of 3.70 cP
minimum. These oils must be replaced with monograde SAE 40 lubricants as soon as
ambient conditions permit. Do not use multigrade or SAE 30 grade lubricants in
two-stroke cycle marine engines or Series 149 under any circumstances.
5. At lower ambient temperatures where sufficient starter cranking speed may not be
achieved to start the engine with SAE 50 grade oils, SAE grade 40 oils may be used. SAE
50 grade oils are not recommended below 45 F (7 C) ambient.