Car & Bike Basic car solutions???

MAGNeT

Skilled
Well just did some work on my 2nd hand santro...the mechanic screwed my royally i guess......

So was thinking to get some basic solutions related to car and use it myself.......for rust the guy used a 32gm wd 40 solution and charged 500 buks i know it might b lot cheaper(3$ us cost the guy washed the price mark on it b4 disposing the bottle).......Now he says to change gear oil and will cost ard 400 buks for 2.5litre.......

So i wanted to know which gear oil,engine oil,brake oil and power stering oil also coolant are good for cars?

Does they differ from car to car....or its not like that...
ALso how is wd 40 for rust stuff i read mix reviews on net...plus lot of scratches on car any solution for that???
 
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