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Z51JEFF · 08-19-2019

I’ve found the BOSCH 3401 is the best for retaining oil for startup. As far as draining the oil cooler,for a first time owner not knowing what’s in the system or system contamination I can see draining the system but no need otherwise.

08-19-2019	#33
Z51JEFF Join Date: Dec 2007 Location: Fremont, CA Posts: 3,093	Re: Installing fuel injectors I’ve found the BOSCH 3401 is the best for retaining oil for startup. As far as draining the oil cooler,for a first time owner not knowing what’s in the system or system contamination I can see draining the system but no need otherwise.