Ive used Mobile 1 since Ive had my first V-8 Mustang. I always change the oil right at or before 3000 miles. By the looks of the oil that comes out, I think its the perfect time. I drive my cars hard and to me the extra cost of that protection is well worth it.
True, you probably can stretch a synthetic oil a little longer between changes, but how much money will it save you when you spin a bearing ??? This is especially true of the Modular motors as the heads need quite a bit of oil. I dont know, I can do a Mobil1 oil change for around $35 and since my car is only driven in good weather during the summer, I dont mind doing it atleast three times a year.
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