Engine oil Mobil or Castrol

Castrol A747. The only failure I've ever had was down to incorrect assemble. Smells lovely too!

I've used Mobile 1 in my 2.4l GM LD9 since new and it now has 188,500 miles on it with zero engine problems. I changed the timing chain myself at 160,000 miles (recommended at 150k) and it looked new with plenty of life left in the tensioner and guides. I also pulled the head and everything was shiney metal, no pits, grooves, or hot spots (uneven wear spots).

But on my motorcycle, I use Mobil 1. Yes, auto oil in a moto engine.

I use Mobil 1 on my cars. I also do a lot of off road driving which puts a good deal of stress on the engine. It's pricier, but I'm fine with paying for the added protection from additives and ability to not breakdown as much due to heat since I'm putting the engine under heavy loads at low speeds much more often than the typical consumer.

5 quarters of mobil 1 0-40 and 1 quart 15-40 mobil all syntetic, runs like a champ and very quiet

I use Castrol Syntec 10w-40 in all of my VR6's and change it around 3000-4000 miles with oil filter (Meyle, Hengst or Topran) I use it in my MK4 and even in my old ass MK3 and never had any problems whatsoever. My MK3 VR6 that a sold a few months back, a.k.a. The Silver Bullet, has over 150K miles on the odometer and still counting and she runs like a beast. The lifters are ticking a bit loud but that's common for any high mileage VR6 engine.

Vw recommends Castrol I wouldn't use anything else

Castrol Syntec 5w40 is stout enough for the 10,000 mile oil change.

So did the oil change today. Mobil 1 0w-40, changed the filter as well, after about 20 miles I can sense a bit more smoothness and slightly better throttle response as compared to whatever else was there.

I've used the OE spec Castrol syntec 5w40 since I bought the car brand new. Do my own oil changes every 5k with the stuff and no issues.