5w-40 synth in a jeep I6 2002

Messages
970
Location
Sweden
Just bought 5w40 SL synthetic for the jeep (80k miles). The manual says 10w30, any API class, but I want synthetic for winter and there are no synthetic 10w30 at all here and the 5w30 is overspeced, hard to find an pricey. 5w40 synth is common. Will the slightly thicker oil be noticeable in any way? This is an old design engine...
 
Messages
855
Location
Ozark Mountains
I have been running 5-40 Shell Rotella Synthetic in a 98 Jeep Wraingler with an I6 for three years now. Same oil for three years but very low miles each year. Runs great with not problems.
 
Messages
25,985
Location
Upstate NY
Originally Posted By: Merkava_4
Going by the UOA section, a lot of those Jeeps seem to do better on 40 weights anyway.
as in 5W40 or 10W40 or 15W40 The manual says 10W30. I have PU 10W30 in my 2001 Jeep 4.0L engine.
 
Messages
437
Location
Michigan
I have been running M1 TDT 5w-40 in my jeep wrangler I6 for 4000 miles so far. I like it and have had no problem, and as far as i can tell it quieted down the engine a little. (easy to hear the engine with no doors or top.)
 
Messages
6,495
Location
Connecticut
Originally Posted By: Merkava_4
Going by the UOA section, a lot of those Jeeps seem to do better on 40 weights anyway.
x2. Rotella 5w40 or Mobil 1 TDT 5w40 seem to be the preferred oils around here for the Jeep 4.0L. My 4.0L runs a bit quieter on a 40 weight oil.
 

lars11

Thread starter
Messages
970
Location
Sweden
ok, interesting. Then the low prices 5w40 it is. Just found out it is SM/CF and ACEA A3/B3/B4. Should be ok for that old iron.
 
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