they can charge more for OEM parts than they can for new cars - less overheads etc. However, the extended servicing means cars can go longer between service visits - the franchised retailers (independent businesses lets not forget) weren't entirely happy about this, but the EU competition commission in, what was it, 2002 or something ruled that consumers should not be tied to authorised retailers for servicing to keep warranty instated, they must be allowed to shop around. So retailers had to get with the 21st century and improve their 'soft skills', start speaking to people like humans and try and sell other services (accessories, mid interval services etc)
In answer to your question, modern engines and modern oil can go fine without servicing for long times
they can charge more for OEM parts than they can for new cars - less overheads etc. However, the extended servicing means cars can go longer between service visits - the franchised retailers (independent businesses lets not forget) weren't entirely happy about this, but the EU competition commission in, what was it, 2002 or something ruled that consumers should not be tied to authorised retailers for servicing to keep warranty instated, they must be allowed to shop around. So retailers had to get with the 21st century and improve their 'soft skills', start speaking to people like humans and try and sell other services (accessories, mid interval services etc)
In answer to your question, modern engines and modern oil can go fine without servicing for long times