So true. Actually, napakalaking abuse of trust yan because some (repeat, some) car owners go to the dealership with full trust na they will be taken good care of, not ripped off!
Ang proper procedure is to ask first what procedures & parts ang balak nila ilagay for service, and then I-present sa customer for approval before any work is done. Sa mga unaware, wag "amen lang ng amen" sa lahat ng sales talk ginagawa ng dealership, and if you're not too knowledgeable about these things, magpasama kayo sa marunong.
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My uncle owned a small talyer so my cousins and I grew up around cars (lalo na yung mga 'senior citizen' na "junker" cars that we'd keep roadworthy one way or another as hobbies) If those "
mechanics" at the casa would try to give us the run around, makakarining sila talaga sa amin- in fact, everybody was dismissive of their skills: "
Ah yung mga yan, di naman marunong gumawa yan, puros replace pyieza lang alam..." Although admittedly, these new 'computer box' and non-carburated EFI cars are beyond our competence without further techincal training. Ika nga sa Robocop3: "I can do the bodywork... but this isn't a Chevy"
As to those "additives" (I won't mention brands na), pero nung super uso yan (mga 10+ years ago), tapos may home TV shopping commercials pa na: "
So and so will bind to the metal parts of your engine, 'eliminating' friction. You can run without oil?!?!" Andami kaming na overhaul na vehicles, mga 2-3 years old pa lang (!) na gumamit ng mga yan. Lalo na yung nasa green na lata na parang 7up can [brand censored]? Naku... sisirain niyan yung mga valve seals/piston rings nyo! We'd examine yung camshafts na so called "treated" PTFE yung metal etc.,
IT MADE NO DIFFERENCE.
We'd often also discover some shiny sand-like "tutong" in the oil pans. Ayan yung so called "additive" treatment.
IMHO, just stick to a good synthetic oil if you want these fancy things, or use the specified grade of mineral oil and change it in accord with the "severe maintenance" schedule in your manual.
