Of course not.You might consider Mobil 1 0w40, it's a pretty thin 40 and many people have used it in engines calling for 5w30 without problems.
Also accepted and commonly used words such as “gnarliest”?Terminology that is accepted as and commonly used is just fine.
Heaviest, thickest, ... is just fine.
You'll want a 5w30 with an HTHS >=3.5. That'll get you the gnarliest 5w30. Start with the Euro or Diesel specs, since some require >3.5 HTHS. This means you'll want the Mobil 1/Castrol/Pennzoil euro oils, and avoid anything API SP/GF6.
https://rotella.shell.com/en_us/pro...i-vehicle-5w30-full-synthetic-heavy-duty.html
https://www.mobil.com/en/lubricants/for-personal-vehicles/our-products/products/mobil-1-esp-5w30/
https://www.pennzoil.com/en_us/products/full-synthetic-motor-oils/pennzoil-platinum-euro.html
https://www.valvoline.com/en/european-vehicle-full-synthetic-motor-oil/
https://www.castrol.com/en_us/unite...castrol-edge-brand/castrol-edge-euro-car.html
https://www.redlineoil.com/5w30-motor-oil
https://www.mobil.com/en-us/commercial-vehicle-lube/pds/gl-xx-mobil-delvac-1-esp-5w30
Flip a coin.
I have a few vehicles with high mileage, Just wanted to learn more about oil viscosities, Do Walmart or my local auto parts store carry European oils.You need to look at the HT/HS not the “weight”. An oil with a relevant European approval is your best bet since the approval will dictate a minimum HT/HS. Grade is irrelevant here as is the winter rating unless you’re starting at very low temperatures.
Is this question related to all your other ones regarding consumption and high miles?
I prefer bodacious!Also accepted and commonly used words such as “gnarliest”?
Euro L. It’s $24 at WMPennzoil platinum L looks like it could be a good heavy 5w30 oil.
Or get quaker state euro 5w-40. Cheaper and better.Pennzoil platinum L looks like it could be a good heavy 5w30 oil.