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raykay · 2nd May 2015, 12:12

DOT 4 or DOT 5.1 are both Polyethylene-Glycol based and either can safely be used.

Do not use DOT 5 as that is Silicone based and is not compatible with DOT 4 or DOT 5.1

2nd May 2015, 12:12	#5
raykay I really should get out more....... Now Other Manufacturer Join Date: Nov 2006 Location: Co. Kerry Posts: 2,786 Thanks: 16 Thanked 310 Times in 283 Posts	DOT 4 or DOT 5.1 are both Polyethylene-Glycol based and either can safely be used. Do not use DOT 5 as that is Silicone based and is not compatible with DOT 4 or DOT 5.1