2013 Prius C - 15K Toyota Synthetic Oil Analysis

Hey everyone,

I've attached an image of the oil analysis after 15,000 miles on toyota synthetic. I drive 4 miles each way to work daily, during summer months the coolant does get up to 180-190F for a few minutes. During the winter, I'll be lucky to ever hit 130-140F while using the heat. This is not good for oil as it prevents excess fuel and water from evaporating during a normal drive cycle. On weekends I'll definitely be getting the engine up to temp at least always for 20 minutes or more each day. It appears my engine has excessive iron and aluminium wear. It's interesting to see that according to the TBN, and the insolubles number, if I was driving this car longer per day I might have better wear and able to go at least 20k per oil change.

I'll use up the rest of the case of Toyota OEM oil I have and probably switch back to Pennzoil Platinum. I haven't seen many oil analysis' on here so hopefully you find this useful!

 

You're right, the data shows what will happen. I'm probably going to switch to 5k interval due to the excessive fuel dilution issues.

I was just curious what would happen on the Toyota OEM synthetic, the initial goal was really just to see how the TBN read after 15k. I'd like to preserve the savings from the great MPG, so I'll be switching to 5k in hopes the wear numbers go down. Something I didn't mention is for about 8 hours a day over 4 days I left the car in Ready mode with a small 500watt inverter connected to the 12v battery. This provided basic power for a large campsite. The excessive stop/start, a 5 or 6 times an hour, may have contributed to additional wear. Weather was warm so the coolant never dipped below about 150F while just sitting in Ready mode. I might time oil changes so it's fresh just before I go camping again next year.