Quote:
Originally Posted by M Fifty
Ah - Confirmation Bias to the fore.
If you're ragging it on a track day there may well be reason to change the engine oil before and after, but that still won't be due to the fully synthetic oils involved breaking down.
Plus, unless your filter is gash, none of that is getting pumped around the engine - it's all being safely collected in the sump.
HTH  |
No not the engine oil, the diff and transmission oil even with standard driving those "lifetime" fluids still degrade and become contaminated.
In regards to the engine oil you'll see increased fuel content from the combustion process and small bits of fuel making it past the piston rings which will degrade oil. Heat cycling to 270*F will degrade your synthetic oil.
You do whatever you want, but if you take a look at every performance shop analyzing why bmws break down so much more frequently compared to other brands it is attributed to infrequent maintenance such as oil changes, fluid swaps, and using crappy parts like chinese oil filter elements.