Engine oil Mobil or Castrol

Castrol. Valvoline. Mobil1. Supertec. Kirkland Signature. All oils my 2016 CX-9 has had. Now has near 100k miles and runs as nice as the day I bought it. Just change the oil and filter every 5k miles and use full synthetic.

SOOOO I've always used full synthetic way before most vehicles started recommending it from the manufacturer. I've ran mobile 1, royal purple, and a few others. When we got our 2007 Mazda 3 all of the records/receipts showed conventional Castrol was used. I've stuck with it to see how it do... I've increased the weight "one step" because we live in a hotter than average climate but we just hit 290k miles with not major issues... my average MPG is 31.x and I typically do 10 over the speed limit (so it could definitely be improved).I change it myself every 5k miles. I think the frequency is more important than the quality with oil. I'd rather have super tech every 3k than mobile 1 every 10k. I think if you stick with any major brand, use a good filter, and change it regularly you'll be fine.

Mobil1…been running it for a decade ap1 supercharged S2K…flawless

AP1 164k miles using Castro edge high mileage 10w-30. In my experience it does not burn as much oil as Mobil 1

Mobil 1 full synthetic. Been using it in all of my cars for years. No issues with burning oil or anything.

Didn't double check, but I bought [this](https://www.speedwaymotors.com/Mobil-1-Supercar-Full-Synthetic-Motor-Oil-0W-40-Dexos-R-Case-6,495272.html).

Mine arrived as advertised.

There's literally only one oil that is certified for use in our cars: Mobil 1 Supercar. Nothing else has the proper Dexos R certification.

I use Castrol edge because it's rated for high temp engines and BMWs run towards the hotter side.

My wife drove her 2008 Passat 2 miles per day for six years. As you can imagine, during these very short drives in winter, the oil became diluted - this was born from sever UOAs. So, I changed the oil every 1,500 miles and the oil and filter every 3,000 miles. Over-kill perhaps but based upon my personal expectations, worth the time and money. We used Mobil 1 0W40....which sheared to a 0W30 fairly quickly and stabilized.

BTW, Mobil runs hotter in my car.