Factory fill is 5w-20 dino. Manual specifies 5w-20 or 0w-20. I typically run Synthetic in most of my vehicles. With the RAV4, OCI's are 5000 miles or 6mo regardless of which oil I run. Lot's of short trips and only average between 800 and 1000 a month on it. Cold here in winter (single digits at times) hot in summer (80's and 90's). I would like to go ahead and run the 0w-20 synthetic but feel it may be overkill with the 5000 mile OCI's required to maintain my warranty. What do you think? Dino or Synthetic? Maybe a Synthetic blend? I do NOT plan or desire to extend my OCI's.
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