I always change it Twice a year spring/fall, and after a long trip. Most of us don't put 6000miles on our cars a year, but like said above, running our engines adds gas blowby into the oil, which kills the viscosity over time. Add the moisture added in from condensation in the winter, so I change it in the spring just before mopar at the strip. Then after the hot summer months, with that heat and today's fast Evap gasoline, the blowby is probably more, so it gets a change on labor day weekend. This year I also changed it in July after a 1500 mile round trip into Utah, and earlier this month on the car's 50th birthday. -- -- -- Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. -- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. http://groups.google.com/group/1962to1965mopars?hl=en. --- You received this message because you are subscribed to the Google Groups "The 1962 to 1965 Mopar Mail List Clubhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to 1962to1965mopars+unsubscribe@xxxxxxxxxxxxxxxxx For more options, visit https://groups.google.com/d/optout.