Engine oil Castrol or RED LINE

Castrol Europeans 0W40 is my typical go-to but Mobil-1 is great, get whichever is cheaper.

Recently started using in my 2002 M3 and the oil runs cooler compared to the "twin power" oem oil i had been using.

Personally on my half million mile M54 E46 I use Castrol edge high mileage 5W-30 with a ok filter; mobile one or the stp extended life filter as those two typically come with the red o rings which tend to last much longer than the black ones.

BMW has been endorsing Castrol since the early 1990's and I have to say that I've never had anything but good results using Castrol. I think it is a great oil and seems to do really well in BMWs.

Hey! I had two Octavias with the 1.6 TDI: the mk2 (I sold it) and the mk3 (the current one). Personally, I prefer Castrol Edge 5W-30. On the mk2 I once used Ravenol and the engine was a bit noisier compared to when I used Castrol.

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.

Redline 10w30 full synthetic if I know I'm going to beat the piss out of it for the next 5k miles (think autocross or mountain runs), otherwise I use Honda 10w30 full synthetic.

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

I use Castrol EDGE Fully synthetic oil in my 2013 Mazda 3 skyactiv. It does burn a little but I did not have any issues.

Engine was noisier with the mix vs. the previously used redline 5w40. Iron levels are up at 6.3 ppm/1000 miles Oil usage increased by 1/2 quart over the redline 5w40 TBN/TAN levels are worse than 5w40 at comparable mileage