I changed from the 5W30 A5/B5 to 5W40 A3/B4 in my 4.4 TDV8 L322 because I wanted better bearing protection and wasn't concerned that there may be a slight increase in fuel consumption. 5W40 is a better heat range for where I mostly drive and can withstand some viscosity degradation yet still be at least 30 grade. An analysis after 12K kms of mostly short drives showed the 100 degC kinematic viscosity index was 12 compared with 13.4 when new, so viscosity had deteriorated but not terribly so and was still well above the 5W30 A5/B5's typical viscosity.
				
			 
			
		 
			
				
			
			
				MY21.5 L405 D350 Vogue SE with 19s.  Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
			
			
		 
	
Bookmarks