Jeep Cherokee 1999 Electronic Service Manual page 1022

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GEN ERAL I N FORM AT I ON (Cont inue d)
API SERVICE GRADE CERTIFIED
Use a n en gin e oil t h a t is AP I Ser vice Gr a de Cer t i-
fied. MOPAR pr ovides en gin e oils t h a t con for m t o t h e
la t est r ecom m en ded ser vice gr a des.
St a n da r d en gin e oil iden t ifica t ion n ot a t ion s h a ve
been a dopt ed t o a id in t h e pr oper select ion of en gin e
oil. Th e iden t ifyin g n ot a t ion s a r e loca t ed on t h e la bel
of en gin e oil pla st ic bot t les a n d t h e t op of en gin e oil
ca n s (F ig. 4).
Fig. 4 Engine Oil Container Standard Notations
SAE VISCOSITY
An SAE viscosit y gr a de is u sed t o specify t h e vis-
cosit y of en gin e oil. SAE 10W–30 specifies a m u lt iple
viscosit y en gin e oil. E n gin e oils a lso h a ve m u lt iple
viscosit ies. Th ese a r e specified wit h a du a l SAE vis-
cosit y gr a de wh ich in dica t es t h e cold-t o-h ot t em per a -
t u r e viscosit y r a n ge. Select a n en gin e oil t h a t is best
su it ed t o you r pa r t icu la r t em per a t u r e r a n ge a n d va r i-
a t ion (F ig. 5).
Fig. 5 Temperature/Engine Oil Viscosity
ENERGY CONSERVING OIL
An E n er gy Con ser vin g t ype oil is r ecom m en ded for
ga solin e en gin es. Th e design a t ion of E NE RGY CON-
SE RVING is loca t ed on t h e la bel of a n en gin e oil con -
t a in er.
CRANKCASE OIL LEVEL INSPECTION
CAUTION: Do not overfill crankcase with engine oil,
oil foaming and oil pressure loss can result.
Th e en gin e oil level in dica t or (Dipst ick) is loca t ed
a t t h e r igh t r ea r of bot h 2.5L en gin es a n d 4.0L
en gin es. In spect en gin e oil level a ppr oxim a t ely ever y
800 kilom et er s (500 m iles). Un less t h e en gin e h a s
exh ibit ed loss of oil pr essu r e, r u n t h e en gin e for
a bou t five m in u t es befor e ch eckin g oil level. Ch eckin g
en gin e oil level on a cold en gin e is n ot a ccu r a t e.
To en su r e pr oper lu br ica t ion of a n en gin e, t h e
en gin e oil m u st be m a in t a in ed a t a n a ccept a ble level.
Th e a ccept a ble levels a r e in dica t ed bet ween t h e ADD
a n d SAF E m a r ks on t h e en gin e oil dipst ick (F ig. 6)
(F ig. 7).
(1) P osit ion veh icle on level su r fa ce.
(2) Wit h en gin e OF F, a llow a ppr oxim a t ely t en m in -
u t es for oil t o set t le t o bot t om of cr a n kca se, r em ove
en gin e oil dipst ick.
(3) Wipe dipst ick clea n .
(4) In st a ll dipst ick a n d ver ify it is sea t ed in t h e
t u be.
(5) Rem ove dipst ick, wit h h a n dle h eld a bove t h e
t ip, t a ke oil level r ea din g (F ig. 6) (F ig. 7).
(6) Add oil on ly if level is below t h e ADD m a r k on
dipst ick.
Fig. 6 Engine Oil Dipstick—2.5L Engine
ENGINE OIL CHANGE
Ch a n ge en gin e oil a t m ilea ge a n d t im e in t er va ls
descr ibed in Ma in t en a n ce Sch edu les.
Ru n en gin e u n t il a ch ievin g n or m a l oper a t in g t em -
per a t u r e.
(1) P osit ion t h e veh icle on a level su r fa ce a n d t u r n
en gin e off.
(2) H oist a n d su ppor t veh icle on sa fet y st a n ds.
(3) Rem ove oil fill ca p.
(4) P la ce a su it a ble dr a in pa n u n der cr a n kca se
dr a in .
ENGINE 9 - 5