Engine oil Mobil or Castrol
Any A3/B4 euro oil. M1 0W40 is really good and well priced.
These engines need 40w either 5w40 or 0w40.. I ran 0w40 Mobil 1 syn euro formula for the 60k miles I had my GTI, it's cheap and readily available in 5qt at Walmart, thinner on cold start up it when hot is still 40w, it's also the factory recommended by Porsche
Mobil 1 ESP 5W30 and Delvac 5W40 are right next to each other at Walmart and usually within a dollar of each other in price. Our 2 cars use Mobil 1 ESP and my diesel Jeep uses Delvac 5W40. Both are good oils, so I think it will just be your personal preference. Blackstone tests will tell you the story on your oil and intervals better than Reddit.
I have a 2010 Jetta TDI cup edition with the CJAA engine and the factory spec listed in the manual is 5W-40… On top of that the oil cap alone has Castrol on it\nSo Castrol 5W-40…. End of story…. I apologize if I sound condescending as I do not mean to and also recognize you may have purchased your vehicle second hand and it may have not come with a manual… But if the top of your 710 aka oil cap says Castrol on it and you truly have a CJAA engine then I guarantee you that Castrol 5W-40 is the proper oil regardless of location or climate Ps…. Anyone who claims to use or recommend anything else has also probably had massive engine problems or engine repairs an question why they had those issues Follow factory spec and maintenance recommendations…. I’m pushing 280k on my CJAA engine without a single issue
Mobil 1 Turbo Diesel Truck 5W-40 in an ALH since new. 10K OCI, engine with 280K running like new.
Mobil 1 ESP 5W40
Mobil1 is great oil and what I personally use.
One of my cars has 240,000 miles and burns 1/2 a quart in 10,000 miles using Mobile 1 5W-20
For example my previous BMW engine was very noisy with mobile 1, and quiet with castrol
Today I changed my engine oil to castrol power1 Cruise 15w-50 with TVS engine oil additive. Post that my engine starts to vibrate at bit early rpm & getting hot more quickly & frequently.
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