My Experience with Schmiedmann & Quaife LSD (BMW M235i – Ohio, USA)Three months ago I ordered a Quaife QDF17N LSD for my 2016 BMW M235i from Schmiedmann in Denmark.I paid $1,400 for the differential.As many BMW owners know, the OEM ring gear on the M235i is welded to the carrier and must be machined off and transferred to the Quaife unit. I followed the official instructions exactly and had a machine shop properly machine and fit the ring gear.When we attempted installation, we immediately ran into a serious issue:• The left-side bearing would not seat fully• The carrier measured approximately 0.3–0.5mm taller• The diff would not sit correctly in the housingI documented everything: • Measurements • Photos • Bearing/shim verification • Part number confirmation (7599411 stamped) • Bearing journal measurement (~6.063” per spec)Schmiedmann insisted the product could not be wrong and suggested installation error.For context: I have 20 years of mechanical experience.To eliminate doubt, I sent the entire differential to a BMW-certified shop here in Ohio.They had the exact same issue.Schmiedmann’s position remained:If I believed there was a defect, I could ship it back to Europe at my expense (around $600+ shipping), and only if they later approved it would anything be considered.⸻The FixThe BMW shop suggested installing a RacingDiff BMW backlash adjustment snap clips kit. I purchased:• Snap clips kit – $390• Assembly labor – $480After installing the kit, the differential seated correctly.Backlash was properly measured and confirmed.I’ve driven 1,500+ miles with zero issues.The diff now works perfectly.This means additional compensation was required that was never disclosed on the product page. It is advertised as a direct-fit replacement.Nowhere does it state that an additional $400 kit may be required.⸻Request for CompensationI asked Schmiedmann only to reimburse the $390 snap clips kit (I did NOT request the $480 labor).They refused, stating they are “only the seller” and cannot cover additional expenses.⸻Warranty ConcernAfter I informed them that I would be sharing my experience publicly, I was told that because the repair was done without their approval, my warranty may be revoked.To be clear:• I attempted to resolve this directly with them for months• I provided documentation and measurements• A BMW-certified shop confirmed the issue• Shipping it overseas was financially unreasonableThe only way to make the differential usable was to purchase the adjustment kit.Now I’m being told that fixing the issue locally — after they declined responsibility — may void my warranty.⸻Why I’m Sharing ThisThis is not about attacking a company.It’s about transparency and accountability.If a product sometimes requires additional components to function properly, that should be clearly stated before purchase.Instead, I experienced:• Months of delay• Nearly $900 in additional expense• Repeated suggestions that I installed it incorrectly• Refusal to assist beyond “ship it back at your cost”• And now possible warranty revocation for making it workThe differential performs great now.But the customer service experience was extremely disappointing.BMW owners deserve full transparency before spending $1,400+ on drivetrain components.
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