Yes, my entire engine is stock. Have you done any kind of service on the car? Replaced the air filter, coolant, etc., gapped your plugs to .028", done a tune up, confirmed that your thermostat is working properly. Checked your radiator for sludge, blockage (even leaves blocking the fins on the outside). Confirmed that you have the proper radiator cap (.9 bar - 13 psi). Coolant level remaining as usual? Also that you have the overflow tank filled to the proper level - if you let this run dry, the hose sucks air into the system, which can cause problems - that hose should always be below the fluid level. Presumably you are advising that its running hotter due to a change in the needle position on the dash? This is not really an accurate indication of temp - it is better to measure your temp with an IR thermometer pointed at the thermostat housing. In any event, if your needle is now in a different position, it would indicate that there has been a change in temp. FYI, my needle has sat at 1/4 for 19 years......