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My 2010 base Rav4 just started exhibiting a growling type noise during cold cranking. I have had the oil changed to 0W-20 recently. Does that have anything to do with it? Would this be another case of condensation being sucked into the engine when I don't drive it much after startup?
 

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Welcome! If you could include a sound recording of the situation it would help forum members to evaluate it. If your RAV has an I-4 engine as in your profile having changed the oil as you mentioned shouldn't cause the sound you are hearing. Haven't heard about the "condensation being sucked into the engine" problem. Perhaps someone else has.
 
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