Engine oil Castrol or Shell

i use shell rotella 15w40 WHITE bottle.

Everyone in the Oldsmobile community recommends Rotella

My machinist loves it

I use it in my 66

Castrol Edge 0W40 A3/B4 (European Formula), about 27$ per 5 quart jug at Walmart. Made in either Germany or Belgium. A real synthetic, Type-4 PAO based (no Type 3). Meets the strictest oil requirements from ze Germans.

I used to use Castrol GTX 20W50 oil with Bardahl B2 additive, but after some discussion on the Bob is the oil guy forum, I decided to try a lighter oil: Shell Rotella 15W40 without any additive. It feels a bit easier to start and runs great (but it did ran great before). However, the oil pressure is certainly lower

12 Galant 2.4 always running Castrol edge 5w20 and oil filter change every 5k miles for like 60k miles now has 126k. Cars have never shut off or left me stranded or left any signs of hesitation.

Generally, brand matters a lot. Amsoil, Mobil 1, and Castrol are all great.

I run Castrol in my older cars and Mobil 1 in newer cars that I care more about.

I usually change the oil every 7500 miles and tend to use Castrol synthetic 0-40.

I just use German made Castrol Edge 0w40 (502 certified) oil. Ive used this oil since the car had its first oil change and it does not burn a drop and car runs great, i now have 59k miles and shes drives new as ever.

I've used Shell Helix Ultra 5w-40 and 0w-40 in my AQY. (we have cold winters here) Both seem to work well, no additional lifter noises, normal mileage. Engine sounded good even just before this years oil change.

I use 5W40, Castrol Edge, has the 502/505 certification, if it doesn't don's use it. You can use the 0W40 European Formula as found at Walmart; is also 502 certified.. This is a good all-year 'round oil.