I use strictly Redline oils for all my fluids except premix. Engine oil is Redline 10w40.
I'm using amsoil 5w30. Great product. Real synthetic. Superior protection.
Redline recommended 10w-40 Full Synthetic for my 1.8 solid lifter JH turbo application and the tech guy suggested modern synthetics don't cause seal leakage (like OG synths of 25 years ago) and holds up way better than the 40w rating in hot temps and protects much better when cold than even the current crop of Castrol 20/50 dino oil I was running. I swapped over the M81 to the same Redline oil and have not yet noticed any new oil leaks yet.
I use Amsoil 0W-20 (also on my 2020 Audi Q3) since it meets the specs.
Amsoil 25k Oil in a 2017 Ford Focus. Went 20k miles. Looked like standard 5k oil when it came out. Engine is still doing great 60k later! I do 7500 mile changes with Royal Purple now.
I use Amsoil in my Ford Fusion.
I use Amsoil European spec 0W20 for my '18 440i. It's engineered for vehicles requiring BMW LL-17FE+ so you know it's good
Switched to Amsoil awhile back and have no regrets.
Amsoil Signature series 5w30 is one of the best oils you can get that meets the oil specifications
If you want oil that has zinc, close to the oe oil weight, and is really good I'd go with ams oil, it is expensive but after 3k miles mine is still really clean
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