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
I use Castrol Magnatec A3/B4 10W-40 part synthetic. 3 years now and no problems.
5W-30 Castrol C4, never fails with my Clio. DPF is safe and sound, no soot, no weird smells.
5W40 Castrol Euro. I get less oil consumption than 5w-30 and it seems to run a bit more smoothly.
Castrol Edge 'Euro Car' 5W-40
Used to get a big white plume on cold starts but no more. Still burn a lot, but not as much
Best oil I've used
Yes you can I’ve been using 10w40 castrol ever since I got it and I’ve been fine
I use Redline but for a million years I used Mobil 1 car oil. Before that we used Castrol 20/50 petroleum oil
I always ran castrol gold motorcycle 20w50 on my Harley's.
Currently using Castrol Edge 5w-40 fully synthetic, previously was using Estremo Heatpro 5w-40 FS, differences is so minimal to the point where you just neglect and forget about it....
Smoothness the same, silky smooth.
Car feels slightly like just slightly lighter on pickup with Castrol.
Castrol edge is junk.
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