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Originally Posted by DeKa
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Mobil, Castrol, Nulon are the familiar and easy to find ones. Mobil is expensive, Castrol and Nulon are ok. However, Castrol Magnatec Professional A1 5W-30 that you mentioned is only synthetic based but not fully synthetic and I haven't seen that before. Never heard or seen Liqui-Moly anywhere.
Instead, there is Castrol Edge Sport 5W-30 which is fully synthetic that you can buy under $40 for 5L lot of times. I have been using this since long and no issues so far. Keeps engine clean, oil stays fresh until 5000kms under tough conditions. I never let my car do more than 5000kms between oil changes. So, I don't how long does it last.
There are other brands that are good as well like Mainlube, Fuchs.. My car demands fully synthetic and have been using Castrol Edge 5W30 which is cheap and does the job for me.