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FYI: I talked to the service manager about oil and 5W-30 is used for all Venza's if not the warranty will be voided. If I where you, I ould go back to the dealer and dump the 0W-20.My wife brought our 2009 V6 in for the 10K maintenace and requested synthetic oil as we supposedly had put in @ 5K. The 5K oil was a 5W-30 Castrol. I requested a synth blend but they didn't have so they put in a full synth for the same price although I just checked the window sticker I stapled to the receipt from back then and it has GTX checked which I know is not synth. I remember I questioned this at the time and the service mgr assured my the full synth was put it. When I checked @ 8900 miles the oil looked very clean unlike it did @ 4800 miles so I would think this would be true or at least I hope so.
When I checked the receipt from the 10K change it listed 0W-20. The window decal also listed Castrol 0W-20. Is this OK? I thought 0W-30 synth should be used in lieu of 5W-30 and 0W-20 in lieu of 5W-20. I am not a car expert so any help would be appreciated.