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.
I tried using valvoline, that burned noticeably faster. But castrol high mileage has been pretty good.
Castrol edge is junk.
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