Engine oil Mobil or Castrol

Mostly Mobil 1. I have been looking into other oils for my Z06 though.

For Nissan I see people tend to prefer Mobil 1 Full synthetic. I don't know what other oil my Sentra was using before but the car runs better on Mobil 1 for me.

ever since 15,000 miles I’ve been using Mobil1 0w40 and Mobil1 oil filter every 5k miles. I’ve used it on both hot 80-100f summer temps and now on winter temps. Haven’t had a single issue. When cold I can tell how the engine revs down quicker since oil is really thick so I couldn’t imagine the 5w. Still it’s been running for more than 50k miles on the Mobil1 0w-40 and it’s been great.

Running the OE Castrol 0w-20, pushing the car very hard up a twisty road in NC/SC, I saw a maximum of 235F with an ambient temp of 75F. My averages with normal driving are close to yours. These temps are well within the oil's capability.

The accord gets regular mobil 1 from walmart.

i been using it religiously for now 85k miles, i have tried Quartz Ineo 5W30 502 Spec oils made my engine produce more heat and valvetrain noises. The Castrol Edge 0W40 I use now tops out at 212, normally sitting between 205 and 210. With the 5W30 Quartz it was constantly sitting at 227-237 which is pretty significant.

this oil is my most trusted, been using it since new with the best results ( i tried Mobil1 0W40 and a 5W30 Total Quartz once each and oil temps were 15-20 degrees hotter in similar ambient temps and conditions with both of those so i decided not to use them again).

I use Mobil1 0w-40 and a Mobil1 filter. Haven’t had any issues. I’ve noticed that when my oil intervals where more far apart the engine would idle at 1,400rpms then feel like it raises it and lowers it like some of the sort. An issue that goes away once I put fresh new oil in everytime. It doesn’t interfere with the engines performance or anything but it’s something I notice on cold starts.

They also have the 5qts of Castrol Edge 5w-40 for under $30. I've been running that in my cars since 2005.

I spent ages today on the phone to numerous SEAT dealers, VW dealers, SEAT HQ, VW HQ, Castrol and Millers. The bottom line is total confusion everywhere. I rang 12 SEAT dealers - all but one (I'll come back to which one)said that VW 505.01 must be (and is)used.