10mm socket and a nut driver handle is great for pressing those plastic wiring harness retainer studs into the holes in the inner fenders, assuming you still have inner fenders

Well growing up in the North where they salted the roads it was no unusual to pound a metric socket on a rusted bolt to get it loose.   So I still use metric tools on old cars and trucks.

Depending on the manufacturer, metric can be a load easier.  My WRX for example uses only 8mm, 10mm, 12mm, 14mm, and 18mm fasteners.  The only exceptions are the half shafts and the transaxle drain plug.  With a handful of sockets, one pin punch, and a Philips head screwdriver you can work on anything on that car. 

The worst vehicles are the half and halfs.  "Well its not a 9/16, and its not a 5/8, ugh!  15mm!"  Meanwhile the bolt right next to it is 1/2". 
 

Rufus68 wrote:

Having a sense of distance between metric values and our standard values is not difficult for me since 1.6 km is 1 mile.  This makes estimating conversions fairly easy and quick.  The system I struggle with is having a sense of temperature when seeing values in celsius.  The conversion from celsius to fahrenheit is not as easy to estimate in the head.  (Formula to convert C to F:  (Celsuis * 9/5 + 32) 

Example --  If I hear that today is going to be 75 deg F, I will know how it is going to feel.  But if I were to hear that it is going to be 24 deg C today, I would not have a clue as to how it is going to feel. 
 

Ahh, Fahrenheit to Celius temperature conversion.  The formula is difficult to do in your head, here is something I learned along the way that may help.  
If you are dealing with temps only above freezing; for every 10 degrees C, F rises 18 degrees.  So:


C= 0 degrees, F = 32 degrees
C=10, F=50
C=20, F=68
C=30, F=86
C=40, F=104
C=50, F=122
And so on.
 
Had to deal with many electrical components where temperature ratings often come in degrees C.
 
Hope this helps.

 

Rudi wrote:

For me c x 2 , + 32 gets me close enough.
Example; 10 c x 2 = 20 , +32 = 52 f.
The actual is 50 f but what’s a couple degrees amongst friends.

Whatever works!