Our Recommendation

Make
PETERBILT
Model
320 Vocational (CNG) (EPA 2017)
Engine
CNG
Year
2017-
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Application
Recommendation
Capacity (ltr)
Engine (CNG) (Cummins Westport ISL G)
 
27.6
Engine (CNG) (Cummins Westport ISX 12G [CNG])
 
45.4
Transmission (Fuller Manual 10/13-speed)
VERKOL SAE 50 TO-4 (a)
12.0 - 14.0
Transmission (Allison)
  (b)
25.0 - 45.0
Differential (Dana Spicer Single Axle 21000-30000 lbs)
VERKOL GT-8/80w90 EP (c)
17.5 - 18.9
Differential (Dana Spicer Tandem 40000-60000 lbs)
VERKOL GT-8/80w90 EP (d)
17.5 - 22.0
Differential (Dana Spicer Tridem 69000 lbs)
VERKOL GT-8/80w90 EP (e)
17.5 - 22.0
Differential (Meritor Single 21000-23000 lbs)
VERKOL GT-8/75w90 (f, g, h, i)
18.0 - 22.4
Differential (Meritor Tandem 40000-46000 lbs)
VERKOL GT-8/75w90 (j, k, l, m)
14.3 - 18.5
Differential (Meritor Tridem 66000 lbs)
VERKOL GT-8/75w90 (n, o, p, q)
18.5 - 26.5
Coolant (Cummins ISL G)
  (r)
12.4
Coolant (Cummins ISX 12G)
  (s)
25.1

Lubricant / Capacity Notes

a.
Alternative recommendations: GO ETN PS386 40
b.
Alternative recommendations: ATF ALL TES389
c.
Alternative recommendations: GO DNA 429 75W-90; GO DNA 429 75W-140; J2360 85W-140
d.
Alternative recommendations: GO DNA 429 75W-90; GO DNA 429 75W-140; J2360 85W-140
e.
Alternative recommendations: GO DNA 429 75W-90; GO DNA 429 75W-140; J2360 85W-140
f.
>-40°C
g.
Alternative recommendations, >-40°C: GO MTR 076M 75W-140
h.
Alternative recommendations, >-26°C: GO MTR 076D 80W-90; VERKOL GT-8/80w90 EP / SALDUBA 80w90 LS / VERKOL GT-7/80w90 EP
i.
Alternative recommendations, >-12°C: GO MTR 076A 85W-140
j.
>-40°C
k.
Alternative recommendations, >-40°C: GO MTR 076M 75W-140
l.
Alternative recommendations, >-26°C: GO MTR 076D 80W-90; VERKOL GT-8/80w90 EP / SALDUBA 80w90 LS / VERKOL GT-7/80w90 EP
m.
Alternative recommendations, >-12°C: GO MTR 076A 85W-140
n.
>-40°C
o.
Alternative recommendations, >-40°C: GO MTR 076M 75W-140
p.
Alternative recommendations, >-26°C: GO MTR 076D 80W-90; VERKOL GT-8/80w90 EP / SALDUBA 80w90 LS / VERKOL GT-7/80w90 EP
q.
Alternative recommendations, >-12°C: GO MTR 076A 85W-140
r.
Mix ratio, 50% >-37°C
s.
Mix ratio, 50% >-37°C

General Notes

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Oil Change Intervals

Engine (CNG) (Cummins Westport ISL G)
Km Max
12000
Months Max
6
Hours Max
500
Engine (CNG) (Cummins Westport ISX 12G [CNG])
Km Max
40000
Months Max
6
Hours Max
500
Transmission (Fuller Manual 10/13-speed)
Km Max
96500
Months Max
12
Transmission (Allison)
Km Min
240000
Km Max
480000
Months Max
48
Hours Max
6000
Differential (Dana Spicer Single Axle 21000-30000 lbs)
Km Max
96500
Months Max
12
Differential (Dana Spicer Tandem 40000-60000 lbs)
Km Max
96500
Months Max
12
Differential (Dana Spicer Tridem 69000 lbs)
Km Max
96500
Months Max
12
Differential (Meritor Single 21000-23000 lbs)
Km Max
160000
Months Max
24
Differential (Meritor Tandem 40000-46000 lbs)
Km Max
160000
Months Max
24
Differential (Meritor Tridem 66000 lbs)
Km Max
160000
Months Max
24
Coolant (Cummins ISL G)
Km Max
45000
Months Max
6
Hours Max
2000
Coolant (Cummins ISX 12G)
Km Max
480000
Months Max
24
Hours Max
6000