Sludge build up after 50,000km

[MoVolvos]

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You buy a new home and after a bit you see cracks in the walls. Instead of going to the builder you hire someone you trust who just add more concrete below the foundation to beef things up. In time the root cause, which is running water under the home erodes the ground and in a heavy storm the foundation sinks damaging the home.

Volvo was never contacted when "sludge" was found. Never had a chance to look for the root cause. Could have just been rings but now it's an engine and there's no way to find out what caused the "sludge" which seized the engine. Three things voided the warranty. First is failure to seek those who are / were responsible, second allowing it to continue to further damaged the engine. Third counting on a 3rd party. Unfortunately, stephiebeez was just along for the ride assuming her mechanic knows his craft. Oh, forgot there's a forth, the flush (additive) which Volvo stipulates is a no no. Can't sue the doctor who put in the pacemaker of loved one if you are seeing another doctor and just getting aspirin for pain associate with the surgery. Especially when causation can no longer be determined when death occurred.

Finally, changing oil is just a normal necessary part of car care. If there was a defect, more oil changes would not have cured the problem especially "sludge"at 25km. At 12K intervals a normal running engine would not have had issues so is irrelevant in the causation of the problem nor have kept the warranty enforced.
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[matthew1]

FWIW, attached is the 2020 Volvo warranty document. This may or may not be the extent of what stephiebeez is bound to. Again, maybe we're not getting the whole story, and we aren't privy to stephiebeez's documents regarding this. I hope she returns to follow up on this.

The correct oil and filter interval is every 10,000 miles = 16,000 km or 12 months WHICHEVER COMES FIRST. For service intervals beyond 150,000 miles/240,000 kilometers, please consult your authorized Volvo retailer.

Full synthetic engine oil meeting the minimum RBS0-2AE/SAE 0W20 must be used. Lower quality oils may not offer the same fuel economy, engine performance, or engine protection.

[Krons]

IMHO the indie mechanic is a red herring. Sure, he has a bit of a professional ethical duty to do... something... and he may have satisfied this duty by simply pointing it out. But at the end of the day you follow the letter of the contract, the contract is enforceable.

Potential the indie mechanic used the wrong oil. Conventional oil at that long of interval can build sludge. And a motive to do an engine flush without contacting the manufacturer affiliate dealer.

[volvolugnut]

No one has mentioned sludge caused by short drive cycles without full warm up.
volvolugnut

[Krons]

No one has mentioned sludge caused by short drive cycles without full warm up.
volvolugnut

Short drive cycles and/or poor quality and/or incorrect oil.

[Krons]

No one has mentioned sludge caused by short drive cycles without full warm up.
volvolugnut

Correct
Short drive cycles and/or poor quality and/or incorrect oil.