Rotella t 30w

[scotty_vince]

Has anyone used rotella t 30w in there dd two stroke?

[HighTechRedneck]

30wt is only advised for consistent use in below freezing weather.

From the Detroit Diesel Lubricating Oil, Fuel & Filters guide - Page 10
http://extranet.detroitdiesel.com/pdf/vocations/Lube-Oil-Fuel-Requirements.pdf

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.

[gus]

My 671 had 30wt in it when I got it and drove it 800mi home. It also had the same stuff in the trans which is supposed to have 50wt.

No harm done that I can see.

I often use 30wt in winter because it is much cheaper at WM which doesn't carry 40wt.