Engine oil Castrol or PENNZOIL

I go every 5k using Pennzoil Platinum 5w-30, though it's just a stock engine/tune and more than half are highway miles

Castrol mangnetec gave me good performance but in city conditions it gave inconsistent fuel economies for me and under normal cruising speed 80-90 it performed really good. But for me it felt like reaching higher speeds above 100 felt slower compared to shell. Initial pick up of my car felt higher with this oil.

The engine itself runs great with the 48K I put on it in the past 2.5 years with biannual oil changes (Pennzoil Ultra Platinum). Averaging 27 MPGs on 91 Octane hwy miles, 24-25 mpg in the city.

I have a 2012 civic with 220k miles still use Castrol 0w-20. I've been using it since 500 miles switched to the high mileage stuff around 100k

Castrol Edge is usually cheaper than Mobil 1 and will be as good.

Can use 5w30 or 5w40.

0w40 or 5w40 will give you slightly better engine protection if you drive at high rpms more often.

I wouldn't use anything cheaper or different than those two really. You don't need more expensive oils than those either.

Castrol edge is just fine, even the cheapest one is likely better than whatever was good 20 years ago.

295,000 miles using Castrol GTX high mileage and fram XG filter

I drive a 2021 RAM 1500 Classic and use only Pennzoil Ultra Platinum with the extended guard filter cartridges. I change my filter cartridge at 5,000 miles and reset my light then at around 10,000 miles, I change the oil and cartridge. There was one time I forgot to change my oil before winter and didn't feel like doing it in the cold so I ended up around 15,000 miles before changing it. The oil was still fairly clean.

For example my previous BMW engine was very noisy with mobile 1, and quiet with castrol

BMW switched from Castrol to Penzoil years ago...but both cause oil starvation in The S65 motor