Engine oil Shell or PENNZOIL

I switched to Rotella about 15 years ago after it worked good in an ej22 that was averaging a quart every 300 miles.

I swear by penz ultra platinum/euro platinum in my cars. Really good anti wear additive package in that stuff.

I had an 03 Camry from new till 2019. Had 335,000 miles when I sold it. That car got Rotella T6 5w40 since new. I still wonder how long that car would have lasted if I kept it.

Fixed many ls engines with excessive oil burning by switching them to t4 rotella 15w-40. The rotella t4 flavor of it is a fantastic oil. If you're engine has good oil pressure and isnt burning oil then theres probably no need to for it but its not gonna hurt a thing. Gen 3 ls engines arent some super tight tolerance engine, i probably wouldn't put 15-40 in a motor that calls for 0-20 but your 5.3 will not care at all.

He may be using it for the 15w40 weight for noise or lower oil pressure. I ran Rotella in my 94 F150 with the 5.8l gas engine because I bought it with a slight knock. After a while I dropped down to the 10w30 Rotella and ran it for year, lifted mud truck driven daily and in the woods on weekends. It will be fine, just get some clarification on why. I currently run Rotella 10w30 in my 4.2l Envoy.

I use Pennzoil Platinum. It's made from natural gas, a cleaner base than crude. My engine loves it. Minimal consumption between oil changes and no leaks.

I went with Pennzoil Ultra Platinum 5w-30. 20k on the clock of my 2023 and it doesn’t burn a drop of oil. I changed the oil at 1k and 3k after that and it always comes out looking beautifully.

Pennsoil 0w30 is a great oil

Shell helix ultra for mb’s spec, change when the car asks to. I’ve not had the car since it was new, so it’s pointless to spend extra money when it won’t make it last longer

I run the diesel Rotella T6 5w-40. My catalytic converter decided to start throwing P0420 codes around 58k miles and I spoke to a shop that I am going to have tune my car and one of the techs said that they reformulated T6 a few years ago and it has more zinc in it than it used to and that might have had an effect on my cat and it's early demise.