Oil Weight for Doosan LPG Forklift

Joined
Aug 5, 2015
Messages
15
Location
NJ, USA
Anyone know the correct oil weight for a Doosan G25N-7? It's a LPG forklift with a Nissan K25 engine. Google searches shows 5W30, 10W30 and 10W40.

Forklift is used mostly indoors in northeast region.
 
Joined
Aug 22, 2019
Messages
1,008
Location
AR
Ours is a G25S-2 with a Hercules propane engine - we it has use 15W-40 and it has 5800 hours so far. It has a hard life so I wouldn't wanna go thinner.
 
Joined
Jan 14, 2015
Messages
2,264
Location
missouri
It's not hard for a engine designed to put put out over 100 HP at 6000 RPM to live at under 50 HP limited to 2500 RPM. All the starts and stops are the worst thing it sees. On propane this is not a big issue as it would be o n gas. Amazing the Mitsubishi starter is still running.
 
Joined
Jul 12, 2012
Messages
3,862
Location
Caldwell Idaho
Ours is a G25S-2 with a Hercules propane engine - we it has use 15W-40 and it has 5800 hours so far. It has a hard life so I wouldn't wanna go thinner.
Just broke in. I worked for a dealership in the SF bay area and I saw many of the high use clients Nissan engines go 35,000 hours running propane and straight 30 Delo. A maintained forklift engine has an easy life.
 
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