Engine oil Mobil or Castrol

I usually change the oil every 7500 miles and tend to use Castrol synthetic 0-40.

As mentioned above, you should consider Mobil 0w40 oil. I've used it for 4 winters now, driving in very similar conditions to what you're seeing, and the oil basically looks new every time I change it at 7000 miles.

I'd recommend changing the oil to a good brand 0W-40, Mobil or Shell. Replace the oil filter as well.

I just use German made Castrol Edge 0w40 (502 certified) oil. Ive used this oil since the car had its first oil change and it does not burn a drop and car runs great, i now have 59k miles and shes drives new as ever.

I ran Mobil 1 ESP 5w40 in my 2.0 TDI for 80k miles and it was great. However it was discountinued so I switched to the Mobil 1 euro spec 5w30 ESP and continued to 120k miles and shortly after switching it gained nearly 2mpg. Both oils remained steady on the dipstick so if it used oil it was very little.

I used light 5w-30 Edge and 0w-30 Mobil 1 SL in my APR 2.0T 6M and had ultra low wear.... With all the advantages of light oil.

I've had issues with Mobil1 0w-40 oil, even though it "meets the spec", and switching to a different brand resulted in less timing chain and valve train noise, and quieter cold starts, which typically means less wear, so I switched.

If it's a stock engine use 5-30. I use Mobil 1 full synthetic 5-30 in my b18c and it's been good for thousands of miles.

I use 5W40, Castrol Edge, has the 502/505 certification, if it doesn't don's use it. You can use the 0W40 European Formula as found at Walmart; is also 502 certified.. This is a good all-year 'round oil.

Castrol EDGE 5w-40 is what I use.