Engine oil VALVOLINE or MOTUL

I use Motul in my built engine (not IAG) per the recommendation of the shop that built it.

If it’s actually an IAG long block, they spec Motul 8100 X-CESS 5W-40 (or an equivalent high quality 5W-40 full synthetic) because their bearing clearances are set up for that weight, not the thinner OEM oil.

If you do research oil analysts here in this sub, Valvoline comes out the best.

Motul is a good oil but i stuck with the OEM stuff when i replaced my clutch

Using high mileage oil (additives to make gaskets swell just a tad bit), used to burn almost a quart between 5k miles but now it's maybe half a quart.

I recently switched from the stock Royal Enfield engine oil to Motul 10W40 fully synthetic. The bike feels noticeably smoother and cleaner.

During all my oil changes, I\u2019ve taken a sample and sent off to Blackstone for analysis.\n\nEven after 12k miles, there\u2019s still enough TBN left that I could have continued using it out to 15k miles.\n\nDissolved metals and other elements were still within universal engine norms so it wasn\u2019t like the sample was abnormally contaminated.

Pero nag stay ako sa motul since 2019.

I run 10w40 5100 motul now. on all bikes etc.

Clutch doesn't like the full syn stuff.

I learned this the hard way switching to Valvoline Restore and Protect 5W-30, destroyed my bearings just like you.