Engine oil Mobil or VALVOLINE

Just change it.

I have a Yaris with 300,000 miles on it. All I use is conventional 5-30 Valvoline.

Been using Mobil1 5W-30 since 1998... GTI now has 232,500 miles and is smooth as silk. I do oil changes on the dot at 5K miles.

I always use VR1 (Valvoline) 20w50. Excellent oil. The car runs beautifully on it and has had no issues.

The part number they listed for each quart of oil was G-E55-540-1B-DSP . Look that up and you'll see why oil changes are expensive. Somehow I don't think the oil is better than the Mobil1 I buy at Walmart at $24 for 5 quarts.....

Mobil1 should be fine. People are anal about oil but I've got 90k on my wrx with regular oil changes every 3-4k miles with Pennzoil ultra platinum or Mobil1 Extended Performance.

Edge Professional 508 is excellent, however, I have to agree with @VWmechatronic , the Mobil 1 sourced stuff is top notch. Almost 5K on mine and level on dipstick has not moved.

I use Mobil ESP VW507.00 5w30, which is on the approved oil list and I buy for $30 when it goes on sale at Canadian Tire.

I use the red bottle in mine. I've found that it leaks/burns the least.

I have the VR-1 race oil on my MR2. Apparently some people said it made my car spit flames.

I put Mobil 1 4 Stroke Synthetic into my Ninja 250. Honestly, any reputable brand 10W-40 oil will do if you change it routinely.