07 LMM has been running on B100 for about 8,000 miles, checked the engine oil today and it smelled like fryer oil and it had lots of oil sludge in it, thick black waxy stuff. Oil was changed about 3,000 miles ago so not sure why the oil broke down so quick. Changed the oil and it still smells like fryer oil and it has sludge in it. Cut open the oil filter and it was plugged. Any ideas as to what happened besides that B100 could be the problem just not sure how?

Engine oil is Delo

07 LMM has been running on B100 for about 8,000 miles, checked the engine oil today and it smelled like fryer oil and it had lots of oil sludge in it, thick black waxy stuff. Oil was changed about 3,000 miles ago so not sure why the oil broke down so quick. Changed the oil and it still smells like fryer oil and it has sludge in it. Cut open the oil filter and it was plugged. Any ideas as to what happened besides that B100 could be the problem just not sure how?

Engine oil is Delo


Bad injector......

could be a bad injector. did you ever think of running a synthetic oil instead of dino oil?

Run the proper fuel in it and see if the problem goes away??

Sounds like a bad injector, about the only way your gonna get that much fuel in the oil.

will try and use normal fuel once bio is burned up, oh i forgot to mention that when i drained the oil i drained about 15qts of oil when i filled in 10 the last time i changed the oil. Trying to find a syn oil but not sure what brand for the low ash stuff. So if it is a bad injector how do I check which injector it is?

If you pulled out 15 quarts, from a 10 quart system, then you need to get this addressed ASAP! Sounds to me like you're getting raw fuel dilution in your oiling system. This is a major catastrophe waiting to happen. I don't know if the issue is directly attributed to the use of B100 or not, but either way, fuel in your oil is very bad news.

I suspect you have a bad injector. I'd change your oil and filter, then head right to the dealer to see if he'll warranty the faulty component(s). Make sure he understands that your gaining fluid in the crankcase. To be honest, the faulty injector may be attributed to the B100 you're running. That's up to you if you want to tell him about that. I would be honest, as it might help diagnose the problem. You would most likely be held liable for the parts at that point.

This is the problem with running outside of the approved fluids while under warranty. If anything goes wrong, there will be a tendency to blame the un-approved item(s), whether there is good proof or not.

I am assuming that I do have a bad injector but I am missing how the fuel gets into the oil because of a bad injector. Also I have no check engine lights as of now and everything else on the truck seems normal ie power

Let us know what the dealer tells you!
I am curoius why you have 15 quarts oil in engine?

iinjector

drain bio out, change fuel filter, fill up with ulsd on your way down to the dealer. iirc the reason you have so much in your crankcase is due to the injector putting way too much fuel into the cylinder, thus causing the unused fuel to be washed past the rings and straight into the oilpan.remember g.m. only approves
b5 and nothing more. thus if you tell them you ran b100 they can
void your warranty. and yes they can prove that the b100 caused too much carbon build up on the injectors causing them to go bad.
sorry to hear of your problems, hope all goes well.