Join Date: Jul 2003
Location: Saugus, CA
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Replying to Topic 'How often you change your synthetic oil?'
I go with 7500 miles, but not because that is the factory recommended interval. The only way to determine the maximum effective OCI (oil change interval) is with a UOA (used oil analysis). UOA allow you to monitor the wear levels and also determine the amount of active additives left in the oil. The oil used, filter used, weather conditions, driving habits and other factors can all influence how long you can go between changes.
My car seems 90% of it's miles on the freeway. 5 miles to the freeway and 40 miles on it, and back every day. With this type of usage, a Motorcraft filter and Castrol Syntec 0-w30 oil, my UOA indicated excellent wear and additives in reserve with a 7500 mile interval. Realistically, I could feasible go even longer, but I won't while the car is still under warranty.
In general, I'd say that dumping a load of Mobil 1 with only 3000 miles on it is silly. If you are of the 3000 mile OCI school of thought, just us a good dino oil. Seeing as my car sees over 2000 miles/month, syn makes a lot of sense for me.
Regarding oil filters, I think the super fancy oil filters are a waste of money. Some do filter a little better than others, but they usually trade off flow for the extra filtering, thereby lowering oil pressure. Really, as long as the anti-drainback valve is working right, I think that any difference is engine wear attributable to different spin-on filter are minute. Bypass filters are a different story altogether. These filters can extend OCIs to incredible lengths, 20000-30000 miles with good oil is easily possible.