What were they proposing as a repair? Keep in mind a dealerships business model does not allow for extensive diagnosis but geared more to fast turnaround and profit. Go get a second opinion.
Seeing on many many automotive boards across almost all brands, water damage from sunroof drains becoming clogged or dislodged. A common complaint of the style. I'll never own one.
"bought these off EBay." Counterfeit parts have become a big problem not just on Ebay but amazon and other on line sites as well. Many reports of seemingly legit plugs, filters, and most anything turning out to be bogus. A Japan stamp on them means nothing. Lots of videos on YouTube showing the...
There are different flavors of Torx so you'll have to determine what you have to get what you need. There is also a GM T-5.5 size that may be what is bedeviling you.
Anything on this list of the recommended viscosity that brings you joy. Some are a wee bit better than others and learning to read the PDS (product data sheets) will free you from relying on random anonymous internet opinion in making a selection. Good luck.
Any misfire codes on warmup? Thinking what seems like oil could more likely be coolant from a slowly seeping head gasket. Checking with a cheap bore-scope when its cold could reveal the source. 1.5 more known for head gasket problems then oil burning. Just a hunch.
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