Engine oil Castrol or AMSOIL

i use castrol 5w-40 european vehicle. fully built and no issues at almost 30k

I run the 5w-40 amsoil diesel oil in mine. No issues whatsoever.

My GT350 gets Amsoil. Had no issues with either one.

Using the same oil but 15W50 for Himalayan. Satisfied with the performance. Even after long rides, the engine feels crisp.

used Amsoil 5w20 last oil change and just did an oil change at ford with motorcraft due to my poor planning… typewriter tick is back with this oil. Didn’t have that at all with Amsoil.

Having recently transitioned from Motul 7100 to Amsoil Metric 10W40 for my Yamaha MT 15, for about 4000km I sought an oil that could deliver reliable engine protection and smooth operation. here are my pros and cons

I use the Castrol Edge oil. I was doing 7500 mile oil changes and on this last one bumped that up to 10k miles. I sent out the oil for analysis to decide if I want to step up to an even larger interval. The comments left by the tester: 'Your CX5's engine looks good in analysis! Your results look really good by comparison after the 10,000 miles. Metals are all within good wear ranges, with iron even showing below-average steel wear. Nice! Titanium is just an additive in Castrol. Very nice! Go 12k miles next fill.' I will heed their advice and go 12,000 miles on this next one.

Castrol German 0w/5w-40

Doesn’t sheer down…

I use Castrol EDGE Fully synthetic oil in my 2013 Mazda 3 skyactiv. It does burn a little but I did not have any issues.

im actually running that oil right now... I hate it tbh. 3,100 on the oil and it has allowed excess engine noise since day one, SUPER harsh cold starts, and now its burning through faster than the catrol I ran when I first got the car. a WHOLE QUART over 750 miles. the oil is thinner than piss going in, and it just doesnt stand up to what my engine can put out like Shell Rotella T6 has been doing...