Garry,
I have sourced the Caltex engine oil and used it with no problems for top ups. 
I have never had the sensors wear through on the brakes. You can run the pads down to a couple of mm of meat without them wearing out. I got about 80,000KM out of my first set of disks and pads but I do a lot of highway KM. Sensors are dead simple to replace as mentioned above. If you go here there are detailed instructions on disc and pad replacement.
Regards,
Tote
				
			 
			
		 
			
				
			
			
				Go home, your igloo is on fire....
2014 Chile Red  L494 RRS Autobiography Supercharged
MY2016 Aintree Green Defender 130 Cab Chassis
1957 Series 1 107 ute - In pieces
1974 F250 Highboy - Very rusty project 
Assorted Falcons and Jeeps.....
			
			
		 
	
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