Motor Vehicle Maintenance & Repair Asked on May 7, 2021
A mechanic recently performed a vehicle repair for me. After he was done, he took a rag, sprayed lots of WD-40 on it, and rubbed it onto several of the hoses in the engine compartment (ex. power steering hoses) to clean them off and make them shiny.
I directed him to stop, because I had no idea if that’s okay for the hoses.
Is it okay to wipe rubber hoses with WD-40?
WD-40 has 1000's of uses!! (if you listen to their marketing...)
But really, it is safe for rubber and one thing they call out on their website.
Keeps weather stripping and rubber car door seals soft and prevents drying and cracking.
Ok, it's not specifically about hoses, but it is about being safe for rubber. WD40 is just a penetrating oil spray - it's not a caustic rust remover or some aggressive chemical. Just a "water displacing" (WD) oil spray and its generally pretty safe (safe for paint, chrome, rubber, glass, body plastics - most materials cars are made out of).
Answered by JPhi1618 on May 7, 2021
Please use silicone spray for rubbers. WD40 doesn't have the solve it all ability. Not really meant for sensors or rubber even if they state it causes no harm. On the long term it collects dust and its not a lubricant.
Answered by Angel Martinez on May 7, 2021
WD40 contains a mineral (petroleum) spirit as a carrier solvent. The mineral spirit WILL soften and swell natural rubber. It is ok to use on fuel and oil hoses but NOT coolant hoses and definitely not on door and window rubbers!
Answered by Hip Hop on May 7, 2021
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