Engine oil Castrol or OEM Toyota

Castrol Engine oil

I've been using 15w40 diesel motor oil in the AMC/Jeep flat tappet engines for nearly 20 years. Castrol makes a line called GTX Classic that's formulated for flat tappet engines as well

Pros: formulated for flat tappet engines
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Castrol Engine oil

5W-30 Castrol C4, never fails with my Clio. DPF is safe and sound, no soot, no weird smells.

Pros: DPF safe and sound
Cons: no weird smells, no soot
Vehicle: Renault Clio
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OEM Toyota Engine oil

I mistakenly put 0w20 in ~1000 miles ago, and though my engine hasn't fallen out while I driving I've seen ~5-10% loss in mpgs and it's a little louder than it was with 0w16.

Cons: loss in mpgs, louder
Vehicle: Toyota Highlander
Mileage: 1000 km
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