Is the engine in our BMW 435i healthy? What oil analysis can tell us

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Update by J.G. Pasterjak to the BMW 435i project car
Apr 5, 2024 | BimmerWorld, BMW 435i, Blackstone Labs

Like many components on modern BMWs, the N55 3.0-liter found in our 435i is known as a robust unit–except for its occasionally fatal flaws.

In the case of the N55, the primary boogieperson–if the internet is to be believed—is rod bearings that will destroy themselves or spin in their journals if you even give them a cross look.

Our friends at BimmerWorld …

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bobzilla MegaDork
4/5/24 9:22 a.m.

If only you had someone to do your testing that is familiar with GRM.... If only. 

karstgeo72 GRM+ Memberand New Reader
4/5/24 2:58 p.m.

Been doing UOAs on my car for the last 5 years - very handy tool and actually picked up an internal engine issue before a catastrophic failure.  The one you have looks completely normal; moly/boron are just normal friction modifier additives.  Fuel dilution looks minimal which is good based on the flashpoint but one downside to Blackstone is that they don't directly test for fuel, its inferred only so often can be a bit wonky if that's an issue you are looking at there are better labs for that.

bobzilla MegaDork
4/5/24 7:59 p.m.

In reply to karstgeo72 :

Their lack of testing is why I started my own private label for people like us. 

JG Pasterjak
JG Pasterjak Production/Art Director
4/5/24 9:25 p.m.
bobzilla said:

If only you had someone to do your testing that is familiar with GRM.... If only. 

 Next oil change. Let's chat.

bobzilla MegaDork
4/5/24 9:53 p.m.

In reply to JG Pasterjak :


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