Engine oil Castrol or Shell

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.

5W-30 Castrol Edge. FPRS uses it and has had very few failures on stock motor cars. I was also running it in my GR86, and Blackstone came back perfect on that car.

Using rotella t4 btw.

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

Castrol in my daily driver. The daily would have a slight ticking when warming up with other brands, not with Castrol, so I been using it for over 100k with no issues.

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

Have a look on Amazon they do some good deals on oil, I normally stick it in my basket and wait for it to drop.

My old car was Castrol 5w30 Magnatec, £28.50 for 4l on Amazon £43.99 from euro.

If you want to do 5k oil changes, best to switch back to Castrol GTX or any cheapo oil as you'll have no significant advantage using synthetic for short periods of time.