My Grand Caravan was bought early in 2005 and the manual says 5w30 but I know the late 2005 Grand Caravan suggest 5w20> Is there any special brand that seems to perform well in the 3.8liter engine
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Theres no such animal as 5W-20 GC. The German offering is only in 0W-30 -- only available at Auto Zone.
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I would stick with your manual wording of 5W-30. The 30W sheers down to a high 20W most times anyways during the OCI. Pennzoil oils have always given me the least amount of consumption in two Caravans I had - one I still have. My 2nd choice would be Castrol.