The Insight uses the thinnest motor oil of an car we work on. Generally, thinner oil will reduce drag and improve mileage. This is not the only reason to follow Honda’s oil viscosity recommendation. The bearing clearances on the Insight are very tight, in order to “hold” the very thin oil. Thicker, higher viscosity, oil may not be able to fit into the small bearing gaps used on the Insight. A wrong oil choice at a quick oil changer could do some serious damage to your engine. Currently, the ONLY vendor of 0W20 oil is Honda, so that’s where we buy our 0W20 oil.
I HAVE USED CASTROL OIL FOR OVER 30 YEARS NOW WHEN I BUY A NEW TOYOTA,0W20 OIL REQUIRED , I CANNOT GET MY OIL.I MAY HAVE TO SWITCH TO AMSOL OR MOBILE TO GET...
The 0W20 is a full synthetic oil. I would use it until the warranty runs out and then switch to 0W30 which is a better oil for fast driving and putting heavy loads on the engine. The 0-W part is needed to give the valve gear proper lubrication during cold starts. Once the engine is warmed up, I prefer a 30 grade over a 20. The 20 part is driven mostly be CAFE fuel mileage compliance.
I HAVE USED CASTROL OIL FOR OVER 30 YEARS NOW WHEN I BUY A NEW TOYOTA,0W20 OIL REQUIRED , I CANNOT GET MY OIL.I MAY HAVE TO SWITCH TO AMSOL OR MOBILE TO GET A STEADY SUPPLY ....AND AT 6 L PER CHANGE...WHO WANTS QUARTS 6.2 QT / CHANGE AND 5 QT/4.4L JUGS ARE USELESS. YOU SAVE NOTHING WHEN YOU HAVE TO BUY 2 JUGS OR 2 EXTRA BOTTLES JUST TO HAVE ONE OIL CHANGE.