So if the radio quits working you won't get it fixed on warranty if the engine has 10w50 oil instead of the grade written on the cap?
I'd just change the cap to match the engine oil.
Besides, there was a topic thread that asked the question if anyone had an engine replaced or repaired on warranty, or if they, or anybody they knew had warranty denied?
If I remember correctly, the topic ran for pages with no examples, just rabbit holes and was eventually locked.
It appears to me that people who post about how thin an oil they run are virtue signaling.
That’s a lot of suppositions, an nobody said you can’t get your head unit fixed under warranty because you used a heavier weight oil in the engine.
If your head unit takes oil, well then, I think warranty is not the biggest problem
I know two folks who were denied warranty work for premature engine failure - one with a Kia and one with a Nissan. Both are using “incorrect” oil weights and specs. Not only were they using heavier weights not specified in any manufacturer paperwork for the model world wide, but they were not using the proper spec oil either, such as with an API SN rating.
I don’t believe either engine failed solely because of the oil, but these folks could not prove the oil was NOT the culprit and did not have the financial means to drag the manufacturers through court over it.
I won’t mention brand names, but when the fluid they pull from your engine has distinct smells or colors that aren’t considered “normal” for an engine oil, it’s pretty easy for them to tell you’ve used the incorrect lubricant for your engine.
Nissan seized up (commented remember exactly why) before it hit 20k miles. It was like 17k or so. Being a truck the owner thought they knew best that it needed heavier oil than anything used worldwide in the manual…
Kia owner I was closer to - his Optima had several issues internally, spun rod bearings, warped piston rings, bent valves from misfires, and so on. Total engine replacement needed. He made it more than six months through the painful warranty replacement process, before he was asked by corporate to produce receipts showing that since the dealer did not service the vehicle, he or some shop did oil changes with the specified oil. All he had were handwritten receipts from having a local friend with a garage full with once again, a oil weight not used or recommended in any part of the world by Kia, because the “mechanic” claimed these Kia engines are sloppy like an AK47 and they need real heavy oil in order to last a long time. I believe Kia claimed they drained something like 20w50 equivalent out of the engine upon inspection (no core how they determined this, but owner admitted he used 15w40 with Lucas upper cylinder additive per his “mechanic’s” recommendation... Warranty denied.
