Engine oil VALVOLINE or PENNZOIL

At the very least, make sure you're using quality oil like Mobil or Castrol or Pennzoil.

I have been using various Valvoline synthetic oils 10+ years in multiple stationary engines, tractors, diesel and petrol engines. No sludge, no varnish inside the engines, and never worn an engine out.

I use Pennzoil Platinum 5W-30 in my 2011 328ix (N51) I believe that is the recommended viscosity.

I use Valvoline restore and protect. It fixed the tick after a few oil changes

5W30 Valvoline Restore and Protect is good

I use 5w-30 pennzoil ultra platinum full synthetic with the oem motor craft oil filter

I change my oil every 3k miles

Frankly, we ran 0W20 for the first 175k miles in our 2017 RAV4. I changed to 5W30 because my Turbocharged Mazda also calls for 5W30.

Valvoline Restore & Protect is reportedly great.

I went to Valvoline once, oil pan emptied itself onto their floors the moment I started the engine. Joking aside I think it's perfectly fine to go to Valvoline, I go there often bringing my own oil and filter, that way I know it's the right oil and it's good quality stuff.

I do believe that Valvoline R and R can cause oil leaks. I have noticed that in a couple of cars.