Oil filter Bosch or AC DELCO

I also use an ACDelco filter (blasphemy, I know).

Honestly I just use whatever BMW certified oil I can find at a good price. Used Motul this time, had Castrol before that. Bosch oil filter.

Absolutely not. Example, I was an equipment manager at a Petroleum tank company. On our generator I tried to use several different manufacturers and the all blew the seals out because of filter material and pressure valves they used. I ended up buying OEM filters and never had a problem after that.

Castrol 5w-30-M with Bosch filter.

[The filter was this](https://m.autodoc.co.uk/bosch/11156545)

You could do another oil and filter change to see if it was that or if the oil was just a coincidence.

OEM Mahle/Mann are best. Next best is the higher end Bosch filters.

Yes, the Bosch 3300 is correct for your car. I just used exactly that one for my oil change a few weeks ago.

I have a 2001 Passat 1.8T, on which the oil and filter have been changed every 6 months or 3K mi, whichever came first. The dealer performed the first 4 oil changes, to the 2-year point, then I took over, always with a Bosch or Napa Gold (Wix) filter. Having received the engine sludge notice, I switched from name-brand dinosaur oil to Mobil 1 at my most recent oil change (last month, 23K miles). Although I receive no adverse temperature or indications at the instrument panel, the valve cover SEEMS perhaps to be running a bit hotter than before. What really concerns me is that, when the engine is warmed up, if I stop and idle it for 30 seconds or so, the engine starts making what to my semi-practiced (but new to VWs!) ear sounds perhaps like valve, lash adjuster, or camshaft bearing clatter. The sound emanates from the rear/cylinder 3-4 area, away from belt-driven accessories, etc. Does this sound like an early symptom of sludge, perhaps associated with insufficient oil pressure at idle? Given my history of frequent oil changes and otherwise by-the-book or better maintenance, I would not have expected to be a sludge victim at 23K miles. I suppose I could have just installed a defective brand-new Bosch filter, or I suppose the synthetic oil could have loosened some sludge from my dinosaur days, but these seem like real stretches for an explanation. Any suggestions regarding diagnostics?

I'm perfect fine running this filter at my shop, Bosch can pay for the new engine and my time to put it in and my customer now has an engine with 300k less miles. Thanks bosh for your crappy quality control.

the local gm dealer here uses the cheap delco filters and they always make my oil pressure drop 10psi