Castrol is notorious for getting dirty very fast (detergents is the popular explanation). Why I like Mobil 1 a lot, doesn't discolor nearly as fast and still a very good synthetic oil.
Pros: good synthetic oil
Cons: gets dirty fast
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A rotary engine builder in my city with 30 years experience absolutely swears by Amsoil XL 5w30. So that's what I use in my RX8 now.
Pros: swears by Amsoil XL
Vehicle:
Mazda
Truth, Its a much debated topic. Local testing has shown M1 0W40 to hold up the best.
Pros: holds up the best
I use 502/505 Mobil-1 0W-40 in my 2012 VW 2.0T, and my 2010 Audi 3.0T. I change every 3000 miles.
Vehicle:
Volkswagen
Mileage: 3000 km
I just changed the oil with 2,960 on the odometer. This is the car's first oil change. Used zero oil since new. New Mann filter and Motul 5-40. Can't prove it but I swear it runs better.
Pros: runs better
Mileage: 2960 km
Mobil 1 Turbo Diesel Truck 5w40 has a more stout additive package and has lower sulphated ash which means less intake valve buildup
Pros: stout additive package, less intake valve buildup
So this morning I went n got some Rotella T6 5w40. filled her up and drove it pretty far. The light didnt come back on. I guess all I needed was an oil change? Sounds a lot quieter in idle too, no ticking besides the fuel injectors.
Pros: quieter idle, light off
Use good oil, Liqui-Moly 5W-40, or Mobil 1 0W-40 "European Car Formula".
Pros: good oil, reliable formula
Initially I used Mobil 1 0w-40 for the first few oil changes... Engine Idle was sort of noisy for a car that had less than 50k miles. What made me switch was when I opened up my oil cap on 2 different occasion to see smoke come out. After that I switched to Motul. With motul the power deliver was more smooth, less aggressive. Engine idle was quieter. The car felt slower but the engine overall seemed healthier. Most importantly i havn't exxperince smoke after opening the oil cap since switching over.
Pros: smooth power delivery, quieter engine idle
Cons: car felt slower
Vehicle:
Volkswagen
Part number: X-CESS 8100
I use extended performance full synthetic - mobil 1. No problems so far.
Pros: no problems so far
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