S10/T10 P/U 4WD V6-173 2.8L VIN B 2-bbl (1983)
Engine Oil: Technical Service Bulletins
Engine Oil - Discoloration
Number:
83-I-20
Section:
VI
Date:
Dec., 1982
Subject:
ENGINE OIL DISCOLORATION - 1983 CHEVROLET BUILT ENGINES - ALL "C", "G", "K", "P", "S" AND "T" MODELS WITH
CHEVROLET BUILT ENGINES - ALL C-5, 6 AND 7,000 MODELS WITH CHEVROLET BUILT GAS ENGINES
TO:
ALL CHEVROLET DEALERS
Chevrolet engine plants utilize Engine oil dye from time to time in various engines as an aid to oil leak detection during the manufacturing
process. The dye causes the oil to glow bright yellow when exposed to "black" light.
Some of the dye material used gives the oil a slight red tint and in some cases has been mistaken by service personnel for automatic
transmission fluid.
Service personnel should be advised that the dye is in no way detrimental, and that the oil should not be changed if this condition is noted.
DISP. CYLINDER
V.I.N. CODE
2.0L
L4
Y
2.8L
V6
B
4.1L
L6
D
5.0L
V8
F,
H
5.7L
V8
A,
K, L, M, P
6.0L
V8
2,
B
6.2L
V8
C,
J
7.0L
V8
E
7.4L
V8
S, W
