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For years I have always used Pennzoil dino oil in 3 of 4 family vehicles. I use Mobil 1 in the 4th one. I see them run specials on Exxon Superflo, and its considerably less than the Pennzoil I've been using. Will changing to the Exxon product cause any problems? I plan on sticking with the...

Hypothetical question for dino oil........ Vintage older car well cared for but driven. Manufacturer calls for 3,000 mile OCI. The car is from the mid 80's before these extended drain period dino oils existed. Could you stretch the drain interval to say 4,000 miles if you use say Mobil 5,000...