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bosch GBH 4-32 DFR repair /service


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Hello to all.....

I am repairing a Bosch multi-drill model n0. gbh 4-32 DFR., due to an oil leak .

I have established which  oil seal needs replacing  and now need to refill with the correct oil.

In the service manual ,the oil quanity/grade is described as >35 ml  / SAE 20  <

The  genuine Bosch  oil  ( 1 ltr) is extremely expensive .

Would i be OK  using SAE 20 mineral motor oil .

Or should i use for hydraulic /fork or other use oil. ?

All replies appreciated 



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