A month ago, a gentleman came to us for oil change in his almost new Pirius 2012 Model (he purchased ~2.3 million).
We recommended him fully synthetic 5/40, but he said its expensive. After half an hour discussion we ended up to pour 5/30 oil for PTT (because he was not willing spend single more penny for engine oil). anyway.
After 2 weeks he came and said the oil (PTT 5/30) is "just Ok". But not very excellent. And he advised that he will buy the oil by himself and will come here for change. We said OK.
After 1 month he came to us and asked to drain the oil. We did. Then he opened the trunk and give us new "bottle" of oil and said he has bought it from Hyperstar (or Makro) because his mechanic friend has strongly advised this oil. And when we saw at the bottle, our jaws were dropped to knees. It was Havoline Motor Oil 20/50 of SG grade. We slightly insist him that its not good oil, but he start staring at very strange eyes and started getting mad. So eventually we poured Havoline 20/50 SG grade oil in his almost brand new Pirius.
Guess what, when he start the car, the "engine check light didn't turned off". It?s a week now and his engine light is not turned off but he (GOD Shower His Blessings on him) still running car. But now he slightly admitted that he will change the oil as per our advise but still next time (after running Havoline for 5K min.). We asked him again to change it immediately and considered it as your loss. But he will run at-least 3K on it. Uff.. what a mentality.
So..... for my 2nd gen prius which oil is best? (Just bought one and needs an oil change)
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Prius manual recommends 0/20 oil which is very much suitable for Winter. But now winter is going so for better results & year round use, 5/30 would be the best choice with 5K interval.
But choose good quality oils from Companies like LM, Kixx, PTT.
If want to choose for longer intervals upto 8~10K, then choose 5/40 from same above companies. But change both filters in the mid way like after 4~5K.
1-check the car condition before working on it return the owner back his car in same if not better condition
2-too many people experimenting with oil, please follow the OEM advice as per their manual no one knows the engine better than OEM.
3-too many people not fond of going through the official documentation but fond of following word of mouth.