Engine oil Shell or Total

I run Rotella in my 49 flathead and in my 91 civic.

As long as you don't have a catalytic converter on it Diesel oil with Zinc is the best

I run Rotella in my E24 at the advice of people on the BMW forums.

So I took his advice and did the Rotella T-4 and MMO in my 71 LeSabre 350. Added a little to the gas, too. I run 93 octane gas. Engine is stock and original, about 90k miles. It's running so smooth now. It was an immediate, noticeable difference.

Used to work closely with Peugeot and talked to their technicians and customers. Their old Prince engine insists must use Total oil. Nasim (previous owner of Peugeot Malaysia) once used Petronas Syntium and they experienced knocking and oil leak. After using Total, it eliminates the problem entirely.

Using rotella t4 btw.

Shell rotella t5 its valvetrain runs much smoother and quieter with a thicker diesel oil.

I only use Rotella T6 in all 6 of the cars at my house.

On the other side, cheaper oil and very good spec. overall i see in Total Ineo Long Life Xtra 0W20 in VW 509 specification area, which is also written in my service book for high efficiency oils.

I've used Rotella T6 in literally all of my bikes since 2017 because it is cheap and has JASO MA2, it is deisel oil.