i never had issue, never had 30min penetration so i do not know if make them weak but 10min sex and never had issue
never broke the condom
If you Google 'oil latex condoms safety' you should find lots of articles.
Coconut oil is recommended by cammers, but I won't use it in case I have a real life booking or sex at home (I use condoms with all partners).
It's well known also a reason to be careful with massage oils.
I also wear latex clothing and have to make sure I don't wear body lotion, skin is perfectly clean before dressing in latex as well as avoid oils whilst wearing. Don't want to damage my investments.
Google 'oil latex clothing' brings similar warnings.