Low Tyre Pressure on new car: just inflate it and move on?

[hellohello123]

so my new car, ive done 80km, and my tyre pressure was 38-40psi on all 4 tyres

last day or two its 36psi x 3, 20psi x 1

Something sinister going on? or just inflate it and forget about it?

I have not been offroading or doing police chases with road spikes

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[OLD8BA]

THE 20PSI could be a problem mate how are you checking them ?? i find best way is to buy a good gauge and rely on that i dont go by sensors
losing 20 is a hell of a lot maybe take cap off and put a bit of spit on valve to see if its leaking there
by the way never trust servo ones they get thrown on ground b some people

 

[hellohello123]

THE 20PSI could be a problem mate how are you checking them ?? i find best way is to buy a good gauge and rely on that i dont go by sensors
losing 20 is a hell of a lot maybe take cap off and put a bit of spit on valve to see if its leaking there
by the way never trust servo ones they get thrown on ground b some people

good point, the in car said 20, the service station one said 21

You can barely tell which one is flat.....

 

[OLD8BA]

for me being an old fart i walk past my cars with low profile tyres on them i always do a double take as they look flat to me lol i run bias tyres on a couple of hotrods that are huge in walls
hope yours is just a leaking valve

 

[Brokestang]

I just changed oil in my 20 gt & checked the tire pressure. Left rear had 21 psi. Found a small piece of metal in the tire. After pulling it off the car I also found a finishing nail in it too. I would take it off & check it to make sure.

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